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ruby92:
ahh... :P

given momentum and time how do u find force?

A.T:
F=ma
mv= momentum

change in momentum per unit time is force.
change in momentum is (mv-mu) = m(v-u)

Hence F=(m(v-u))/t
as (v-u)/t = a , we get F=ma

Dunno if this anwers your question LOL

ruby92:
mass is 12kg at u=5ms-1 collides with another obj at rest with mass of 8

i found out that the V total velocity is 3
and that kinetic energy lost is -60J
how do we find the exchange force..which By the way is 73N

wht exactly are the differences in momentum and kinetic energy when objects collide elastically and inelastically
 ???

Monica:
@A.T : Thank you for your help in the forum, I can see you are new so welcome. +rep.

astarmathsandphysics:
elastic collisions - momentum and energy conserved
inelastic collisions momentum conserved, energy not conserved

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