Work/Speed Question

Question

Question

A block of mass m = 7.90 kg is released from rest from point A and slides on the frictionless track shown in the figure below. (Assume ha = 6.60 m.)

(a) Determine the block's speed at points circle b and circle c .

point	m/s
point	m/s

(b) Determine the net work done by the gravitational force on the block as it moves from point circle a to point circle c .
J

Answer 1

Answer #1

a) work done = change in kinetic energy
1/2 m(Δv)² = mgΔh

Δv = √ (2gΔh)

speed at point B = v_b - 0 = √ (2g3.4) =

v_b = 8.17 m/s

speed at point c = v_c - 0 = √(2g4.6)

v_c = 9.5 m/s

b) net work done by gravitational force = mgΔh

w_ac = 7.9 X 9.81 X 4.6 = 356.50 J

answered by: cc urgent!!!!!!

Answer 2

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