Question

Find the velocity of a body of mass 40 kg having kinetic energy of 80 J​

Answer 1

Answer:

The velocity of a body of mass 40kg having kinetic energy of 80 J is 2 km/hr.

Explanation:

Given:

Mass of body = 40kg

Kinetic energy (KE) of body = 80 Joules

To Find:

The velocity of a body of mass 40kg having kinetic energy of 80 J.

Formula used:

• Velocity (v) = $\sf \bigg( \sqrt{\dfrac{2KE}{m}} \bigg)$

Solution:

To find the velocity of a body = ?

Using the formula,

Velocity (v) = $\sf \bigg( \sqrt{\dfrac{2KE}{m}} \bigg)$

v = $\sf \bigg( \sqrt{\dfrac{2 \times 80}{40}} \bigg)$

v = $\sf \bigg( \sqrt{\dfrac{2 \times \cancel{80}}{{\cancel{40}}}} \bigg)$

v = $\sf \sqrt{2 \times 2}$

v = $\sf 2$

∴ Therefore, The velocity of a body of mass 40kg having kinetic energy of 80 J is 2 km/hr.