While lifting a building material at a construction site

PHYSICS · Multi-part · CBSE · Physics · Work and Energy · Work and Energy

Problem

While lifting a building material at a construction site, a crane pulls the load vertically upward through a distance of

15\,\text{m}

. During this interval the crane is known to have done

2.94\times10^{5}\,\text{J}

of work on the load. (i) Calculate the magnitude of the force exerted by the crane on the load. (ii) Express your answer for force in scientific notation to two significant figures. (iii) If the same force continues to act for an additional vertical displacement of

35\,\text{m}

, how much extra work will be done? Express the result in megajoules.

Related theory

Work by Constant Forces
Work
Work, energy and power
Work done by a constant force
Work and Energy

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