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A ball of mass 150 g, moving with an acceleration 20 m/s², is hit by a force, which acts on it for 0.1 sec. The impulsive force is

1. 0.5 N
2. 0.1 N
3. 0.3 N
4. 1.2 N

Correct answer: 1.2 N

Solution

Impulse is given by the product of force and time, or equivalently by the change in momentum. Here, the force is calculated as F = ma = 0.15 kg × 20 m/s² = 3 N. The impulse is then F × Δt = 3 N × 0.1 s = 0.3 Ns. Thus, the impulsive force is 1.2 N.

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