A child (12 kg) is sitting on a sled (10 kg) which is glidingacross a frozen lak

Question

A child (12 kg) is sitting on a sled (10 kg) which is glidingacross a frozen lake at 5.0 m/s . The child is hit by a largesnowball (1 kg) thrown from in front of the sled at ahorizontal velocity of -15 m/s. Calculate the impulse of the snowball on the child. Thanks. A child (12 kg) is sitting on a sled (10 kg) which is glidingacross a frozen lake at 5.0 m/s . The child is hit by a largesnowball (1 kg) thrown from in front of the sled at ahorizontal velocity of -15 m/s. Calculate the impulse of the snowball on the child. Thanks.

Explanation / Answer

v2=[m2-m1/m1+m2]u2+[2m1/m1+m2]u1=[1-22/23]*-15  +      [2*22/23]*5=13.69+9.56=23.25m/sec

hence

impulse ofthe snow ball=change in momentum of the snow ball

                                                 =1*23.25=23.25 Nsec

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