Math

Particles p and q of masses 2m kg and m kg respectively are attached to the ends of a large and inextensible string which passes over a smooth fixed pulley. They both hang at a distance of 2 meters above horizontal ground. The system is released from rest.
Given that the particle Q does not reach the pulley:
Find the greatest height that Q reaches above the ground

Original post by allegrosquir

Particles p and q of masses 2m kg and m kg respectively are attached to the ends of a large and inextensible string which passes over a smooth fixed pulley. They both hang at a distance of 2 meters above horizontal ground. The system is released from rest.
Given that the particle Q does not reach the pulley:
Find the greatest height that Q reaches above the ground

Great.

You tried anything, or do you want us to do this Q for you?

Reply 2

allegrosquir

OP

2

I found that a=3.3 and v=3.6 (speed of p when it hits the ground) . I checked my solutions ant they are right.
I tried to do the question. But my answer is wrong. I think that u=0 as they are released form rest and v=3.6 and a=3.3. So the answer should be 3.96( 1.96+2). But it is wrong.

Reply 3

allegrosquir

OP

2

Original post by RDKGames

Great.

You tried anything, or do you want us to do this Q for you?

My reply is above

Original post by allegrosquir

My reply is above

Can you post your working?

Reply 5

allegrosquir

OP

2

Original post by RDKGames

Can you post your working?

Here

IMG_20171024_214424.jpg506.3KB

Reply 6

allegrosquir

OP

2

Original post by RDKGames

Can you post your working?

Is there anything wrong with the working?

Original post by allegrosquir

Is there anything wrong with the working?

When P hits the floor, Q becomes a projectile upwards. If the final speed of P is 3.6 then the initial speed of the projectile Q is 3.6 upwards. You must treat Q as a projectile now and find the highest it goes.

Reply 8

allegrosquir

OP

2

Original post by RDKGames

When P hits the floor, Q becomes a projectile upwards. If the final speed of P is 3.6 then the initial speed of the projectile Q is 3.6 upwards. You must treat Q as a projectile now and find the highest it goes.