Question

Standing on a friction-less ice surface, a skater of mass 70 kg fires from his
rifle of mass 5 kg. As a result, the skater starts moving in the opposite
direction with velocity 2 cm.s
-1
. If the bullet moves with velocity 20 m.s
-1
, find
its mass.

Answer 1

Answer:

Skater Mass = 70 kg

Velocity = 2 cm/s

K.E. = mv²

K.E. = 70*2*2

K.E. = 280

Fire from his rifle of mass = 5 kg

Velocity = 20 m/s

= 5*20*20

= 2000