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7. A boy 60 kg hops …

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7. A boy 60 kg hops with a horizontal velocity of 5 ms-1 on a stationary skateboard.The skateboard weighs 4 kg. Find out the velocity when the board starts rolling?The condition given here is that any external unbalanced force is absent.

Posted by Neha Barthwal 8 months, 4 weeks ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 3 years, 9 months ago

Let v be the velocity of the girl on the cart as the cart starts moving.
The total momenta of the girl and cart before the interaction = (50 x 5 m s-1) + (4 x 0 m s-1)

= 250 kg m s-1
The total momenta after the interaction = (50 + 4) kg x v m s-1

= 54 v kg m s-1
According to the law of conservation of momentum,
Total momentum before the interaction = Total momentum after the interaction

→ 54 v = 250

v = 250/54 = 4.62 m/s

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