Question

Two toy-cars A and B of masses 500 g and 200g
respectively are moving with the same
speed. Which of the two has greater kinetic
energy ?​

Answer 1

Answer:

A car has greater kinetic

energy.

Answer 2

Explanation:-

Mass of A = 500 g

Mass of B = 200g

Since, they have same Velocity.

• By using kinetic energy formula :-

→$\huge \boxed{ K_e = \dfrac{1}{2}mv^2}$

→$K_eA = \dfrac{1}{2}\times \dfrac{500}{1000}\times v^2$

→$K_eA = \dfrac{v^2}{4}$

→$K_eB = \dfrac{1}{2}\times \dfrac{200}{1000}\times v^2$

→$K_eB = \dfrac{v^2}{10}$

• By comparing denominator.

We can say that kinetic energy of body A is more in comparison of body B.

Conclusion:-

$\boxed{K_eA > K_eB}$