Question : If a particle covers half the circle of radius 𝑅 with constant speed then
(A) Change in momentum is 𝑚𝑣r
(B) Change in 𝐾. 𝐸. is 1/2 mv^{2}
(C) Change in 𝐾. 𝐸. is mv^{2}
(D) Change in 𝐾. 𝐸. is zero
Answer : option (B)
Solution :
If a particle covers half the circle of radius 𝑅 with constant speed then
with
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