A car accelerates on a horizontal road due to force exerted by
The engine of the car
The driver of the car
The earth as weight of the car
The road
(d)
Due to frictional force by the road.
A child weighing $25 \,kg$ slides down a rope hanging from a branch of a tall tree. If the force of friction acting against him is $200 \,N$, the acceleration of child is ……….. $m / s^2$ $\left(g=10 \,m / s ^2\right)$
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