A force of 6 N acts on a mass of 1 kg which acquires a velocity 30 ms-1. The time for which the force acts is
Correct answer: C. 5s
- A. 26 s
- B. 6s
- C. 5s
- D. 2s
Explanation
Force is the rate of change of momentum. F = Δp / Δ t ==> F = mΔv / Δt F = 6 N ; m = 1 kg ; Δv = 30 - 0 = 30 m/s ; Δt = ? 6 = 1 x30 / Δt Δt = 5 s
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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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