Question

A man lifts a brick of mass 5kg from the
floor to a shelf 2 metres high. How much work is
done ?​

Answer 1

Answer:

m=5kg

h=2m

g=9.8

by potential energy formula =mgh

=5×9.8×2

=98joules

therefore 98joules of work is done

Answer 2

Answer:

W = 98 Joule

Explanation:

Mass of brick (m) = 5 kg

Height of shelf (h) = 2 meter

Work (W) = ?

Use g = 9.8 m/$sec^{2}$

Using formula-

W = mgh

W = 5×2×9.8

    = 10×9.8

W = 98 Joule