Question

12. Assertion : A body moving with higher speed has more Kinetic energy
Reason: Kinetic Energy of a body is directly proportional to its speed.​

Answer 1

Answer:

A and R are correct and R is the correct explanation of A

when velocity is doubled

K=1/2(mv  

2

) bceomes K  

′

=1/2(m(2v)  

2

) = 4[1/2(mv  

2

)]

so KE becomes four times

Explanation:

Answer 2

Answers:

The assertion and the reason are both correct, and the reason is the correct explanation of the assertion.

Explanation:

Kinetic energy is the energy of motion observable as the motion of an object, particle, or group of particles.

The formula of kinetic energy is $K.E.=\frac{1}{2}mv^2$.

This formula shows us that the energy of a moving object, kinetic energy, depends on how much mass the object has and how fast (speed) it is going. Therefore, something has more kinetic energy the more mass it has. More kinetic energy is present when something is moving faster.

Therefore, a body's kinetic energy is directly correlated with its speed, and an object travelling faster has more kinetic energy.

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