A box of mass is pushed up a frictionless plank long onto a truck platform that is high

PHYSICS · Single correct · CBSE · Physics · Work and Energy · Work and Energy

Problem

A box of mass

4\,\text{kg}

is pushed up a frictionless plank

5\,\text{m}

long onto a truck platform that is

2\,\text{m}

high. Taking

g = 9.8\,\text{m/s}^2

, determine the work done against gravity. (a)

39.2\,\text{J}

(b)

196\,\text{J}

(c)

78.4\,\text{J}

(d)

80\,\text{J}

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