A 2 kg object is moving at 3 m/s. It comes to rest in 5 seconds. What is the retarding force?

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• A 1.2 N
• B 0.6 N
• C 0.3 N
• D 1.5 N

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Answer: A. 1.2 N

Deceleration a = (3 - 0) / 5 = 0.6 m/s^2. Retarding force F = m x a = 2 x 0.6 = 1.2 N.

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