A 50g bullet is fired at a speed of 600m/s from a 4 kg gun which is suspended by wires and is free to move. What is the speed of the recoil of the gun?

Question

jfraser · Answer

use the equations of motion to find the acceleration of the bullet.
Use F = ma to find the force exerted on the bullet
The same force is exerted by the bullet ON the gun.
Find the acceleration of the gun
Use the equations of motion to find the recoil speed of the gun

anonymous · Answer

or save the trouble and use the law of conservation of momentum!.. total initial momentum = total final momentum!

yanyan · Answer

what about the speed?

anonymous · Answer

what do you think about the problem?? .. tell me why do you think the gun recoils in the first place?

yanyan · Answer

i already got the momentum... but what is asked is the speed,.

anonymous · Answer

yea.. now tell me what is the formula for calculating the momentum?

yanyan · Answer

mv

yanyan · Answer

the product of mass and velocity

anonymous · Answer

Use momemtum conservation...

anonymous · Answer

initial momemtum = 0

final momemtum = m1v1 + m2 v2

anonymous · Answer

0 = m1v1 + m2v2

anonymous · Answer

v2 = -m1v1/m2

here -ve sign indicate the gun moving backward

yanyan · Answer

thanks!

anonymous · Answer

Welcome...