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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