NEET Physics Question - Work Energy and Power - Work Done by Constant and Variable Forces

Assertion (A): An athlete accelerates from rest to its maximum speed due to friction between his shoes and track.

Reason (R): Positive work done by frictional force increases the kinetic energy of athlete.

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Solution:

Assertion is true: An athlete pushes backward on the ground, and the ground exerts a forward static friction force on the athlete, causing acceleration.

Reason is true: The static friction force acts in the direction of the athlete's motion. Therefore, it does positive work, which directly increases the athlete's kinetic energy \(K\) according to the work-energy theorem.

Both A and R are true, and R provides the correct explanation for A.

Rankers Physics

Athlete’s Acceleration and Friction

Solution:

Leave a Reply Cancel reply