A B A student builds a roller coaster as shown. The heights of the points are A= 2.1 m B= 0.9 m C= 0 m. The mass of the marble is 5 g. Assume the ball is released at point A on the track and there is no friction. How much energy does the marble start with? units How much gravitational potential energy does the marble have at point A? units What is the velocity at point A?

A force acts on a particle that moves along the X axis and varies with position according to the graph shown. if the mobile starts from the origin.  a. calculate the work done by the force when it moves from position x=8m to position x= 13m. b. find the average power that force develops if it takes 0.5 seconds to reach the position x= 2m

A baseball hits the catcher’s glove with a horizontal velocity of 55m/s. The mass of the baseball is 0.15kg. The displacement of the ball due to the deformation of the catcher’s glove and the movement of the catcher’s hand is 23cm from the instant the ball makes contact with the glove until it stops. a. How much kinetic energy does the baseball have just before it strikes the glove? b. How much work does the catcher have to do to the ball during the catch and is it positive or negative? c. What is the average impact force exerted by the glove on the baseball? Answer parts a-c. Include units and direction.

Constructed Response 1 Jim is lying on his back on the ground throwing a ball in the air and catching it. There is a balcony 10 meters above his head onto which he is trying to land the ball. On his last throw the ball lands on the balcony. The graph below shows the potential and kinetic energy of the ball from when it left Jim's hand to when it landed on the balcony. ★ Graivational Potential energy A Kinetic energy 200 180 160 140 120 100 80 60 40 20 0. 0. 4 9. 10 Height (m) 8. 2. Energy (J)