A block of mass m = 4.60 kg is released from rest from point O and slides on the frictionless track shown in the figure below. (Assume h = 6.70 m.) h, 3.20 m 2.00 m (a) Determine the block's speed at points and 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 to point ©.

A block of mass m = 4.20 kg is released from rest from point and slides on the frictionless track shown in the figure below. (Assume h = 6.00 m.) h₂ m 3.20 m 2.00 m (a) Determine the block's speed at points and Ⓒ. point Ⓡ point Ⓒ m/s m/s (b) Determine the net work done by the gravitational force on the block as it moves from point J to point Ⓒ

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1) Figure 2 illustrates a block having mass M positioned on a ramp having ramp angle 0 above the horizon. The contacting surfaces have a coefficient of kinetic friction, lk. The block is released from rest and it slides down the ramp such that the magnitude of its vertical displacement is H. The speed of the block when it reaches the bottom of the ramp is Vf. Determine expressions {Uk, 0, g, H, M} for the following: a) the work done on the block by friction; b) the work done on the block by the normal force; c) the work done on the block by gravity; and d) the final speed V¢ of the block M Figure 2 H

1.) A book of mass 0.55kg is lifted from the floor to a height of 3.5m at a constant velocity. Recall the definition of work. How much work is done by FLift? By Fg? By Fnet? How much gravitational PE does the book have at the top relative to the floor?  2.)If the object in Q1 is released from rest after it is lifted, what is its kinetic energy just before it hits the floor? What is its speed?