1. A 9 kg object is moving in a straight-line with an initial speed of v m/s. It takes 10 s for the speed of the object

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1. A 9 kg object is moving in a straight-line with aninitial speed of v m/s. It takes 10 s for thespeed of the object to increase to 14 m/s and it kinetic energyincreases at a rate of 19 J/s. What is the initialspeed v (in m/s)? You may treat this as anisolated system.
2. A ball is thrown straight up with an initial speed of vm/s. The ball was released 2.9 m above the ground, but when itreturns back down, it falls into a hole 13.6 m deep. If the ball’sspeed at the bottom of the hole is 29 m/s, what was the initialspeed v (in m/s) of the ball? You may treat this as an isolatedsystem.
3.A player is able to accelerate a 0.6 kg ball from rest to aspeed of 35 m/s. What is the work (in J) done on the ball by thisplayer? You may assume that the ball travels perfectly horizontally(i.e., parallel to the ground) during itsacceleration.