# Physics AS levels Multiple Choice Help!

This discussion is closed.
#1
A lead pellet is shot vertically upwards into a clay block that is stationary at the moment of impact
but is able to rise freely after impact.
The pellet hits the block with an initial velocity of 200ms–1. It embeds itself in the block and does not emerge.
How high above its initial position will the block rise?
(Mass of pellet = 5.0g; mass of clay block = 95g.)

Correct answer is 5.1 m but i dont know how to get it.
0
8 years ago
#2
(Original post by physicshelp1)
A lead pellet is shot vertically upwards into a clay block that is stationary at the moment of impact
but is able to rise freely after impact.
The pellet hits the block with an initial velocity of 200ms–1. It embeds itself in the block and does not emerge.
How high above its initial position will the block rise?
(Mass of pellet = 5.0g; mass of clay block = 95g.)

Correct answer is 5.1 m but i dont know how to get it.
First use the principle of conservation of momentum to find the final velocity of the block and the pellet.

Then use SUVAT (you have the initial speed, final speed and acceleration...you need to find s, the displacement) to get your answer.
1
8 years ago
#3
Please Can Anyone help me in this question Using steps, In finding
0
8 years ago
#4
(Original post by usycool1)
First use the principle of conservation of momentum to find the final velocity of the block and the pellet.

Then use SUVAT (you have the initial speed, final speed and acceleration...you need to find s, the displacement) to get your answer.
Please Can Anyone help me in this question Using steps, In finding
0
6 years ago
#5
Momentum before collision = mu + m(0) = (5/1000) x 200 = 1
Momentum after collision = (m+m) x v = 0.1 x v
Conservation of momentum 1 = 0.1vv = 10 ms-1
v^2 = u^2 + 2as
v = 10
a =g = 9.81
u = 0
s= ?
10^2 = 0 + 2x9.81xs
S = 10^2/ (2x9.81)
S = 5.09 = 5.1
2
3 years ago
#6
Why did you use 0.1 instead of the 0.095 kg
0
3 years ago
#7
it is because
m+m=2m

95+5 =100g=0.1 kg
1
3 years ago
#8
(Original post by Manahil01)
Why did you use 0.1 instead of the 0.095 kg
(Original post by mallikabomjan)
it is because
m+m=2m

95+5 =100g=0.1 kg

By the way, to Manahil01, a warm welcome to TSR.
1
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