Question

Starting from rest a car moves on plane. The coeffi-
cient of friction (u) between the tyres and the plane
increases linearly with the distance (x). Kinetic energy
(K) of the car depends on x as
​

Answer 1

Answer:

Support car moves a distance dx at a distance x.

μ=kx

f

r

=kx(mg)

Work done by friction =K.E(E)

E=f

r

dx=mgkxdx

E∝x

2