urgent!!!!! acceleration on a string- Isaac Physics Question

Hey guys urgent help needed please anyone help me with these isaac physics please thank you.

A particle Q of mass 2.0kg is resting on a frictionless surface. It is attached to one end of a piece of elastic string, with the other end of the elastic being attached to a fixed point. Q is then pulled back and released from rest with the elastic extended 0.50m beyond its natural length.

After the particle has been accelerated, the string becomes slack. Rather than being allowed to continue in some kind of oscillatory motion, the string is cut when it first becomes slack. The particle is travelling at a speed of 4.0ms −1
when this occurs.

Assuming no losses to friction or other dissipative forces:

part A: Calculate the energy stored in the elastic before Q was released from rest.

part B: What is the maximum tension in the elastic during the process?

part c: Q then makes an elastic collision with a stationary body P and rebounds back along the same track at 3.0ms −1 .
Calculate the mass of P.

part D: Calculate the velocity of P after the collision.

part E: If Q had instead been accelerated from rest by a small motor giving a power of 40W, how long would it have taken to reach a speed of 4.0ms −1?

A: We can assume conservation of energy, so kinetic energy of Q is energy stored in elastic.
....

In physics, we don't assume conservation of energy.
Even friction is present, energy is still conserved and the law of conservation of energy still holds.

Assuming no losses to friction or other dissipative forces

A: We can assume conservation of energy, so kinetic energy of Q is energy stored in elastic.
B:using F=kx and E=1/2 k x^2 you should be able to use the energy and max length to calculate the max tension.
C: Conservation of momentum.
D:More Conservation of momentum
E: Use kinetic energy formula and Power * time = energy

Your statement isn't consistent - you say that we don't "assume" it, then say that it's true.

The question says:

So, I'm not seeing your point.

Hey guys urgent help needed please anyone help me with these isaac physics please thank you.

A particle Q of mass 2.0kg is resting on a frictionless surface. It is attached to one end of a piece of elastic string, with the other end of the elastic being attached to a fixed point. Q is then pulled back and released from rest with the elastic extended 0.50m beyond its natural length.

After the particle has been accelerated, the string becomes slack. Rather than being allowed to continue in some kind of oscillatory motion, the string is cut when it first becomes slack. The particle is travelling at a speed of 4.0ms −1
when this occurs.

Assuming no losses to friction or other dissipative forces:

part A: Calculate the energy stored in the elastic before Q was released from rest.

part B: What is the maximum tension in the elastic during the process?

part c: Q then makes an elastic collision with a stationary body P and rebounds back along the same track at 3.0ms −1 .
Calculate the mass of P.

part D: Calculate the velocity of P after the collision.

part E: If Q had instead been accelerated from rest by a small motor giving a power of 40W, how long would it have taken to reach a speed of 4.0ms −1?

guys please help me out i am stressing over this

If it is true, there is no point of assuming it is correct. The word "assume" has the implication that it is not right.
I have not encountered a well-written physics text that assumes the conservation of energy.

Read what I am quoting.

The question is the question and what I am quoting is what I am quoting. If you want to "over-interpret" it, I cannot help.

guys please help me out i am stressing over this

A particle Q of mass 2.0kg is resting on a frictionless surface. It is attached to one end of a piece of elastic string, with the other end of the elastic being attached to a fixed point. Q is then pulled back and released from rest with the elastic extended 0.50m beyond its natural length.

After the particle has been accelerated, the string becomes slack. Rather than being allowed to continue in some kind of oscillatory motion, the string is cut when it first becomes slack. The particle is travelling at a speed of 4.0ms −1
when this occurs.

Assuming no losses to friction or other dissipative forces:

part A: Calculate the energy stored in the elastic before Q was released from rest.

part B: What is the maximum tension in the elastic during the process?

part c: Q then makes an elastic collision with a stationary body P and rebounds back along the same track at 3.0ms −1 .
Calculate the mass of P.

part D: Calculate the velocity of P after the collision.

part E: If Q had instead been accelerated from rest by a small motor giving a power of 40W, how long would it have taken to reach a speed of 4.0ms −1?

In physics, we don't assume conservation of energy.
Even friction is present, energy is still conserved and the law of conservation of energy still holds.