Question

a body of mass 10 kg moving with velocity 3 collides with another stationary body of mass 5kg as a result the two words stick together the kinetic energy of composite mass will be

Answer 1

by the conservation of the momentum Momentum after colliding and before colliding is equal so we can see that M1U1is equal to M2U2
10×3=15×V
V=2
KE=
$(1 \div 2)m {v}^{2}$
and we can easily calculate this