In an inelastic collision, two objects collide with each other and come to a rest. The first object’s initial momentum was 30kg⋅m/s . If the second object’s mass is 40kg , what was its initial momentum?
a) −30kg⋅m/s
b) 0kg⋅m/s
c) 30kg⋅m/s
d) 40kg⋅m/s
Since in inelastic collision too the momentum is conserved,
so, m1 x v1 + m2 x v2 = (m1+m2) x 0 (as after collision both objects come to rest)
m1 x v1 = 30 kg.m/s (given)
m2 = 40 kg (given)
v2 = -30/40
so its initial momentum = m2 x v2 = 40 x (-30/40) = -30 kg.m/s
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