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Sahay Sir > Question Answers > Cengage JEE Mains Physics by B.M Sharma > Chapter 7 - Work, Energy and Power > A block of 4kg mass starts at rest and slides a distance d down a friction less incline ( angle 30^∘) where it runs into a spring of negligible mass. The block slides an additional 25 cm before it is brought to rest momentarily by compressing the spring. The force constant of the spring is 400Nm^−1. The value of d is (take g=10ms^−2)

A block of 4kg mass starts at rest and slides a distance d down a friction less incline ( angle 30^∘) where it runs into a spring of negligible mass. The block slides an additional 25 cm before it is brought to rest momentarily by compressing the spring. The force constant of the spring is 400Nm^−1. The value of d is (take g=10ms^−2)

A particle of mass m is moving in a circular path of constant radius r such that centripetal acceleration is varying with time t as k^2 rt^2 where k is a constant. The power delivered to the particle by the force acting on it is