In the high jump, Fran's kinetic energy is transformed into gravitational potential energy without the aid of a pole. With what minimum speed (in m/s) must Fran leave the ground in order to lift her center of mass 1.78 m and cross the bar with a speed of 0.634 m/s?

A 50.2-g golf ball is driven from the tee with an initial speed of 58.0 m/s and rises to a height of 22.4 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. (b) What is its speed when it is 7.23 m below its highest point? (a) Number (b) Number Units Units

A 4 kg particle has an initial velocity of (6i–3j) m/s. Some time later, its velocity changes to (8i+3j) m/s. What work (in J) was done by the resultant force during this time interval?

nestion 6 of 8 The superheroine Xanaxa, who has a mass of 67.5 kg, is pursuing the 72.1 kg archvillain Lexlax. She leaps from the ground to the top of a 173 m high building then dives off it and comes to rest at the bottom of a 15.3 m deep excavation where she finds Lexlax and neutralizes him. Does all this bring about a net gain or a net loss of gravitational potential energy? O gain O loss By how much will gravitational potential energy U, change? Answer with a positive number. Assume g = 9.81 m/s². Ug