a 3.0 kg block start from rest at the top of a 30 incline and slides 2.0 m down the incline in 1.5seconds. determine determine the magnitude of the accaleration of the block. the coefficient of kinetic friction between the block and the plane. the frictional force acting on the block the speed of the block after it slides 2.0 m.

A flat-bed truck weighing 7200 lb carries a 1500 lb box. As the truck starts from rest with a constant acceleration, the box slides 10 feet to the edge of the bed in the time that it takes the truck to acquire a velocity of 25 mph in a distance of 50 feet up the incline. Determine the coefficient of friction between the box and the truck bed. acx= 10.74 ft/s2 N = 1498 lb ay = 0 ft/s2. arx 13.44 ft/s2 f=575 lb 100 5 ac/x-2.697 ft/s2 Mk=0.384

I Review The 250-kg crate rests on the ground for which the coefficients of static and kinetic friction are ug = 0.5 and uk = 0.4, respectively. The winch delivers a horizontal towing force T to its cable at A which varies as shown in the graph. Originally the tension in the cable is zero. (Figure 1) Part A Determine the speed of the crate when t = 3.9 s. Hint: First determine the force needed to begin moving the crate. Figure Express your answer to three significant figures and include the appropriate units. • View Available Hint(s) T(N) ? 800 T= 400 2 Value Units v = I(s) 4

- Determine the acceleration of the system. - Determine the magnitude of the force that each crate exerts on the other.

The 152 kg block shown starts with a velocity of 3.00 m/s downward from position A and slides down the incline plane to position B. The coefficient of friction between the block and the plane is u = 0.15. What is the velocity of the block at position B? Note: answer to be in meters/second (m/s). 20 m 152 kg H = 0.15 12 A B

a 1.5 lb brick is released from rest A and slides down the inclined roof. if the coefficient of friction between the roof and the block is u = 0.3, determine the speed at which the brick strikes the gutter G.