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:

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Answer 2

Answer:

0.4 m.s-2

Explanation:

m1 = 5kg

a1 = 2 m.s-2

F = m1a1

Or, F = 5 * 2

Or, F = 10 N

a2 = 0.5 m.s-2

F = m2a2

Or, m2 = F/a2

Or, m2 = 10/0.5

Or, m2 = 20kg

Now, m1 + m2 = 5 + 20 = 25kg

Acceleration produced by combined masses

= F / (m1 + m2)

= 10 / 25

= 0.4 m.s-2 (Ans)