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Friction is the retarding force for the block. F = ma = μR = μmg. Therefore, from the first equation of motion v = u − at.

1. v = V − μg × t
2. V / μg
3. a = F − μR / m
4. 5 ms⁻²

Correct answer: v = V − μg × t

Solution

The equation v = u − at is modified here to include the effect of friction, where acceleration a is replaced by μg (frictional deceleration). Thus, the correct form is v = V − μg × t.

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