Inclined Ramp_2

A block of mass m = 4 kg is initially at rest at the top of a rough ramp of length L = 15 m that is at an angle θ with the horizontal. The block is released and slides down the ramp. The coefficient of kinetic friction between the block and the ramp is 𝜇_𝑘 = 0.24. Calculate the magnitude of the kinetic frictional force |𝐹_𝑘 | acting on the block. Determine the magnitude of the acceleration |𝑎| of the block. Calculate the time it takes to reach the bottom of the ramp.