Question

A ball of mass 1kg moving at 2ms-1 hits another ball of mass 2kg moving at 1ms-1 in same direction after hitting the ball of mass 1kg starts to moves at 1ms-1 . Find the velocity of 2kg ball.

Answer 1

Explanation:

Law of con. of momentum.

m

1

v

1

+m

2

v

2

=m

1

v

3

+m

2

v

4

1×21+2×(−4)=1×1+2v

v=6m/s

i.e, direction of B is reversed.

e=

vel.ofapproach

vel.ofseparation

=

21−(−4)

6−1

=0.2

loss in K.E.=

2

1

(1×21×21+2×4×4−1×1×1−2×6×6)=200J

impulse =2×6−2×

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