NTSE Stage 2 SAT 2019 Exam Question Paper

Question : 65 of 100

Marks: +1, -0

The gravitational potential energy difference per unit mass between the surface of a planet and a point 100 m above it is 1000 J/kg. How much work is required to be done in moving a 5 kg object 100 m on a slope at 30° to the horizontal on this planet?

1250 J
2500 J
4350 J
5000 J

Validate

Solution:

Difference in gravitational potential energy per unit mass

{u_2-u_1}/m={ΔU}/m={mg'(h_2-h_1)}/m=g'h

{ΔU}/m=g'h⇒1000J{/}Kg

Work done (W) = mgh sin30°

W=5x10x50

W=2500J

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