Question

A 2.5 kg ball is dropped onto a concrete
floor. It strikes the floor with a momentum
of 20 kg • m/s and bounces away from the
floor with a momentum of 16 kg • m/s.
What is the change of momentum of the
ball?
(A) 4 kg • m/s
(B) 8 kg • m/s
(C) 32 kg • m/s
(D) 36 kg • m/s
(E) 40 kg • m/s A 2.5 kg ball is dropped onto a concrete
floor. It strikes the floor with a momentum
of 20 kg • m/s and bounces away from the
floor with a momentum of 16 kg • m/s.
What is the change of momentum of the
ball?
(A) 4 kg • m/s
(B) 8 kg • m/s
(C) 32 kg • m/s
(D) 36 kg • m/s
(E) 40 kg • m/s @Physics

Answer 1

A?

Answer 2

36...
momentum is vector quantity!!!
initially p (momentum = mv) was downward... after hitting its upward... so change in momentum would be
p final - p initial
since the dirctions are opposite so they'll just sum up