Question

as a block falls through the air by 40m it does work equal to -1800j . Determine the mass of the block

Answer 1

MASS OF BLOCK IS 4.5 kg

Given:

• Block falls by 40 metres.
• Work done is -1800 J

To find:

Mass of block ?

Calculation:

The change in height will cause a change in the potential energy of the block. This ∆PE will be equal and opposite to the work done.

• Let mass of block be m.

$\Delta PE = - W$

$\implies mg(\Delta h) = - W$

$\implies m \times 10 \times40= - ( - 1800)$

$\implies m = \dfrac{1800}{400}$

$\implies m = 4.5 \: kg$

So, mass of block is 4.5 kg.