A force of 5 N acts on a body of 5 kg for 5 sec. The rate of change of momentum is
Correct answer: B. 5 N
- A. 25 N
- B. 5 N
- C. 50 N
- D. 125 N
Explanation
The rate of change of momentum is given by the formula F=Δp/Δt , where F is the force applied, Δp is the change in momentum, and Δt is the change in time. Here, the force is 5 N, the time is 5 sec, and the mass is 5 kg. Therefore, the change in momentum is 5×5=25kg m/s. Dividing this by the time of 5 seconds, we get F=25/5 =5N.Incorrect Options Explanation:(a) 25 N: This is the change in momentum, not the rate of change of momentum.(b) 50 N: This is not the rate of change of momentum; it's the force applied.(d) 125 N: This value is not correct for the rate of change of momentum.
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Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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