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Standard X

Physics

Work Done by Force of Gravity

A helicopter ...

Question

A helicopter lifts a $72$ $k g$ astronaut, $15$ $m$ vertically from the ocean by means of a cable. The acceleration of the astronaut is $g / 10$ . What is the net work done on astronaut? $(g = 9.8 m / s^{2})$

- 10584 J

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- 20584 J

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- 105.84 J

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- 205.84 J

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Solution

The correct option is A $- 10584 J$
Work done by gravitational force on a object in causing a displacement = $W = m \to g . \to s$
$= - m g s$
$= - 72 \times 9.8 \times 15 J$
$= - 10584 J$

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A helicopter lifts a 72 kg astronaut, 15 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/10. What is the net work done on astronaut? (g=9.8m/s2)

The correct option is A −10584JWork done by gravitational force on a object in causing a displacement = W=m→g.→s=−mgs=−72×9.8×15J=−10584J

A helicopter lifts a $72$ $k g$ astronaut, $15$ $m$ vertically from the ocean by means of a cable. The acceleration of the astronaut is $g / 10$ . What is the net work done on astronaut? $(g = 9.8 m / s^{2})$

The correct option is A $- 10584 J$
Work done by gravitational force on a object in causing a displacement = $W = m \to g . \to s$
$= - m g s$
$= - 72 \times 9.8 \times 15 J$
$= - 10584 J$