Q5.3Multiple choice
A cricket ball of mass 150 g has an initial velocity u = (3ˆi + 4 ˆj) m s −1 and a final velocity v = − (3ˆi + 4 ˆj) m s −1 after being hit. The change in momentum (final momentum-initial momentum) is (in kg m s1)
- (a)zero
- (b)– (0.45ˆi + 0.6 ˆj)
- (c)– (0.9ˆi + 1.2ˆj)
- (d)– 5(ˆi + ˆj) .