Standing on a balcony, you throw your keys to a friend standing on the ground below. one second after you release the keys, they have an instantaneous velocity of 13.9m/s, directed 45 below the horizontal. what initial velocity did you give them?
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Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.