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WAEC Physics 2010 Paper

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Question : 13

Total: 50

A moving body of mass 25.0kg undergoes a uniform retardation of 20.0ms^-2. Calculate the magnitude of the retardating force

1.25N
8.00N
45.00N
500.00N

Solution:

Concept:

Newton's second law of motion states that force equals mass times acceleration.

Explanation:

Retardation is negative acceleration, but we only need magnitude.

Use

F = ma

.

Mass,

m = 25.0\,kg

.

Retardation,

a = 20.0\,m\,s^{-2}

.

So,

F = 25.0 \times 20.0

.

F = 500.00\,N

.

Answer:

D.

500.00\,N

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