A cannon shoots a ball with an initial velocity of 152-ms, Ask an Expert

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Q. A cannon shoots a ball with an initial velocity of 152-m/s and a launch angle of 62°. The gravitational acceleration is 9.80 m/s2. Assuming no air resistance, how long would the cannonball stay in the air?

Q. A 31.00 kg girl is bouncing on a trampoline. All through a certain interval after she leaves the surface of the trampoline, her kinetic energy decreases to 195J from 435J. How high does she rise during this interval? Avoid air resistance.

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