Question

An object moving with a speed of 35m/s and has a kinetic energy of 1500 J, what is the mass of object?

Answer 1

the mass of the object is 2.45 kg.

Answer 2

Given:

An object moving with a speed of 35m/s and has a kinetic energy of 1500 J.

To find:

Mass of the object?

Calculation:

The expression for kinetic energy of object of mass m and moving with velocity v is :

$\sf \therefore \: KE = \dfrac{1}{2} \times m \times {v}^{2}$

$\sf \implies \: 1500 = \dfrac{1}{2} \times m \times {(35)}^{2}$

$\sf \implies \: m \times {(35)}^{2} = 3000$

$\sf \implies \: m \times 1225 = 3000$

$\sf \implies \: m = \dfrac{3000}{1225}$

$\sf \implies \: m = 2.44 \: kg$

So, mass of the object is 2.44 kg.