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Problem 7 - Entrance Test

A body is moving with a velocity of 10 m/s. It is brought to rest in 2 seconds. Find the deceleration of the body.

Correct: D

Using the equation of motion, v = u + at. Given v = 0, u = 10 m/s, t = 2 s. So, 0 = 10 - 2a. Solving for a, we get a = 5 m/s^2.