A block of mass m = 5.60 kg is released from rest from point A and slides on the

Question

A block of mass m = 5.60 kg is released from rest from point A and slides on the frictionless track shown in the figure below. (Assume ha = 7.90 m.)

point      m/s point      m/s A block of mass m = 5.60 kg is released from rest from point A and slides on the frictionless track shown in the figure below. (Assume ha = 7.90 m.) Determine the block's speed at points circle b and circle c. Determine the net work done by the gravitational force on the block as it moves from point circle a to point circle c.

Explanation / Answer

a) 0.5*m*vb^2 = m*g(7.9-3.2)

vb = sqrt(2*4.7*9.8) = 9.598 m/s


0.5*m*vc^2 = m*g(7.9-2)

vc = sqrt(2*5.9*9.8) = 10.75 m/s

b)

Work done = chnage in kinetoc energy

W = 0.5*m*vc^2 - 0 = 323.792 J

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