The Student Room Group
Reply 1
this is momentum not moments.
initial momentum = final momentum = 0

0 = (0.040kg * 500ms-1) + (5kg * -v)
0 = 20 - 5v
20=5v
v = 4ms-1
Reply 2
thanks but can someone please explain to me what is happening. I can't seem to understand it. Can you show it in the form m1u1+m2u2=m1v1+m2v2
Reply 3
mgunugun+mbulletubullet=mgunvgun+mbulletvbullet
5kg x 0ms-1 + 0.04 kg x 0 -1 = 5kg x Vgun + 0.04 x 500ms-1
V = -4ms-1
speed of gun = 4 ms-1 to the other direction