A body starts with a velocity of and accelerates uniformly at . What is its velocity after (in m/s)?

Answer and explanation

Correct answer: B. 30

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  1. Step 1: For rectilinear motion under uniform acceleration, final velocity is given by .
  2. Step 2: Insert initial speed , acceleration , and elapsed duration : .
  3. Step 3: Evaluating the sum gives .
Answer
30.
Why not the others: '72' multiplies instead of adding initial velocity to ; '9' adds acceleration directly to velocity () without multiplying by time ; '24' calculates only the velocity increase , omitting the initial velocity .

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