Question

A body of mass 10 kg starting from rest accelerates uniformly to a speed of 30 m/s in 10 seconds. Breaks are applied and the body stops in next 5 seconds. The distance travelled by the body
(a) 200 m

(b) 225 m

(c) 300 m

(d) 400 m

Answer 1

Answer:

200m

Explanation:

A body of mass 10kg starting from rest, accelerates uniformly to a speed of 30m//s in 10s. Brakes are applied and the body stops in next 5 seconds, (figure). Calculate the accelerating force and the stopping force. ∴ Retarding force F=ma=10(-6)=-60N.

Answer 2

Answer:

D-400 m

In 10 seconds it

covers 300 m.

Then the brakes are applied.

the accelerating force stops and stopping force starts.

And finally the body stops covering a distance of 400m

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