Question

Find the kinetic energy of a ball of mass 400g moving at a speed of 20 m/s?

Answer 1

Given that:

• Mass = 400g
• Speed = 20 m/s

Need to find:

• Kinetic energy = ?

Solution:

The Formula to find the kinetic energy —

${\qquad} {\bigstar{\boxed{\sf{k.e = \frac{1}{2} m {v}^{2}}}}}$

According to the question —

$\sf \implies \: k.e = \frac{1}{2} \times (0.400kg) \times {(0.20 \frac{m}{s}) }^{2} \\ \\ \sf \implies \: k.e = 0.008 \: joule$

Hence,Kinetic energy will be 0.008 Joule.