alleryA porter lifts luggage of 20 kg from the ground onto his head, 2 m above the ground. Calculate the work done on the luggage (take g = 10 ms⁻²).
A200 J
B400 J
C350 J
D150 J
Answer & Solution
Correct answer: B. 400 J
1. Work done against gravity = mgh.
2. Substitute m = 20 kg, g = 10 ms⁻², h = 2 m.
3. W = 20 × 10 × 2 = 400 J.
_Source: RRB Group D CEN-02/2018 PYQ, Q.84._
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