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Question
How much force (in N) must act on a 20 kg body if it is to accelerate at the same rate as a 500 g body would accelerate when a 5 N force acts on it?
How much force (in N) must act on a 20 kg body if it is to accelerate at the same rate as a 500 g body would accelerate when a 5 N force acts on it?
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Solution
The correct option is D 200
Acceleration of the body of mass 500 g, a = F/m = 5/0.5 = 10 m s−2.
If the body of mass 20 kg must accelerate at 10 m s−2,then the force acting on it must be, F = m a = 20 ×10 = 200 N.
Acceleration of the body of mass 500 g, a = F/m = 5/0.5 = 10 m s−2.
If the body of mass 20 kg must accelerate at 10 m s−2,then the force acting on it must be, F = m a = 20 ×10 = 200 N.