Question

4.
If momentum of an object is increased by 10% then its kinetic energy will increase by
(1) 20%
(2) 21%
(3) 40%
(4) 19%
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Answer 1

don't know this one

sorry

Answer 2

Answer:

hi good morning.. the ans is 21%

Explanation:

let initial momentum=mv

10% change= mv + mv/10= 11mv/10=   1.1mv

now,

initial kinetic energy in terms of momentum is=  mv^2/2m

final kinetic energy=  (1.1mv)^2/2m

take ratio ...u will  get Kf/Ki=1.21

percentage increase will 0.21*100= 21%