19. Using a rope, you pull a large 150 kg sled while accelerating at 0.2 m/s² across a horizontal (level) but icy surface. For a coefficient of kinetic friction between the sled an ice is 0.1. Calculate the total work when pulling the sled, a distance of 10 m. a. b. 30 Joules 300 Joules C. 1500 Joules d. 1800 Joules e. None of these are correct

86. What is the kinetic energy of a 20kg object moving at 2 m/s? * O a. 10 J b. 20 J C. 40 J O d. 100 J

1. a brick with mass 30 kg rests a top a 12 m tall wall. What is the brick's gravitational potential energy relative to the ground? a. 2400 J b. 360 J c. 240 J d. 3600 J 2. A brick with mass 20 kg rests atop a 12 m tall wall. The brick is nudged off the wall, and falls to the ground. How fast will the brick be going as it hits the ground? Neglect air resistance. a. 12 m/s b. 120 m/s c. 0 m/s d. 15.5 m/s

In the Figure below, we see a 500 gram block resting on the horizontal portion of a "track", whose left end is curved upwards. The horizontal portion of the track is frictionless, except for a 50.0 cm long “rough" portion, shown in the Figure, where the coefficient of kinetic friction is 0.300. The curved portion of the track is frictionless. The block is held against a spring (which has a stiffness constant of 500 N/m), compressing the spring by 10.0 cm. Then the block is released from rest. (NOTE: The block is not attached to the spring; it is just held against the end of the spring.) For simplicity, assume that g = 9.80 m/2. 50.0 cm

A ramp is inclined at an angle of 30°. A 5 kg block has an initial speed of 8 m/s up a ramp. It comes to rest after traveling 3 m. There is friction between the block and the ramp. a. Draw the free body diagram for the block. b. What is ∆K for the block? c. What is ∆Ugrav for the block? d. What is the work done by friction? e. What is the work done by the normal force? f. What is the coefficient of kinetic friction? g. The coefficient of static friction is 0.7. After the block comes to rest, does it start sliding down the ramp, or does it remain fixed in position? Explain your reasoning and state how much friction acts on the block. Draw the free body diagram.

A sprinter is practicing exiting the starting blocks with a large amount of power. What can the sprinter do to increase their power? A. Perform more work in the same amount of time B. Apply the same amount of work in a longer amount of time C. Perform the same amount of  work in a longer amount of time

150 kg object is at a height of 12 m. A.) How many joules of kinetic energy does it gain when it falls to the ground?  B.) Using concepts of energy, find the speed of the object in meters per second just before it hits the ground.