Q. 215.0( 1 Vote )

# When the speed of a ball is doubled its kinetic energy

(a) Remains same

(b) gets doubled

(c) Becomes half

(d) becomes 4 times

Answer :

B

__Explanation__: Because kinetic energy is directly proportional to square of speed

Kinetic Energy = --- (i)

If speed becomes doubled then V= 2v putting in the equation we have now new Kinetic Energy = --(ii)

Dividing Eq (ii) and (i) , We will get New Kinetic Energy as 4 times than the older one.

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