Question

A crane lifts a load of 1000kg very slowly through a vertical distance of 150cm calculate the work done against gravity if g=10 meter per second square?

Answer 1

Answer:

formula for work done against gravity = -mass×gravity×height

Answer 2

The work done against gravity is 15 kJ.

Explanation:

Given that,

Mass of the load, m = 1000 kg

Vertical distance covered by a crane, h = 150 cm = 1.5 m

To find,

The work done against gravity.

Solution,

When a crane covers some vertical distance it will posses a gravitational potential energy. It is given by :

$P=mgh$

g is the acceleration due to gravity

$P=1000\times 10\times 1.5$

P = 15000 Joules

or

$P=15\ kJ$

So, the work done against gravity is 15 kJ. Hence, this is the required solution.

Learn more,

Gravitational potential energy

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