Determine the work that is done when lifting a 4 kg box to a height of 2.5 m.

m = 4 kg.

g = 9.8 m / s ^ 2.

h = 2.5 m.

A -?

The work of force A, when lifting the body, is determined by the formula: A = F * h, where F is the force under which I lift the load, h is the height of the load.

The force F with which the load is lifted, according to Newton’s 3 law, is equal to the force of gravity m * g: F = m * g.

The formula for determining the work will take the form: A = m * g * h.

A = 4 kg * 9.8 m / s ^ 2 * 2.5 m = 98 J.

Answer: when lifting the body, work is done A = 98 J.

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