A ball is thrown straight upward with an initial speed of 30 m/s. Assuming there is no air resistance, how high does the ball go before falling back down?
[Ques. 2] A bicyclist starts from rest at the top of a hill and rolls down the hill without pedaling. Assuming there is no friction and the bottom of the hill is 20 meters below the top, what is the bicyclist's speed at the bottom of the hill?
[Ques. 3] What is the kinetic energy of a 5,000-kg truck traveling at 25 m/s?
[Ques. 4] A person with a mass of 60 kg climbs up to a diving board 4 meters above a swimming pool. (a) How much work does the person do? (b) What is the diver's kinetic energy upon entering the water after diving off?
[Ques. 5] A mover slides a refrigerator 5 meters across a floor. If a force of 200 N was used, how much work was done?
[Ques. 6] A railroad car with a mass of 20,000 kg rolls into a second stationary car with a mass of 40,000 kg. The cars latch together and move off with a speed of 1.2 m/s. How fast was the first car moving before the collision?
[Ques. 7] A 50-kg ice skater moving at 6 m/s collides with a second stationary skater with mass 70 kg. The skaters cling together after the collision and move without friction. Compute their speed after the collision.
[Ques. 8] A light aircraft that weighs 1,600 N is accelerated at 8 m/s/s for 15 seconds. The work done on the aircraft is _________.
Fill in the blank(s) with correct word
[Ques. 9] A hunter notches a 0.05-kg arrow in a compound bow and draws the arrow back to set the bow. The hunter does 50 J of work in the process setting the bow/arrow combination and then releases the arrow. The speed of the arrow is ___________.
Fill in the blank(s) with correct word
[Ques. 10] A worker on top of a radar tower 80 m high drops a wrench off the tower. The speed of the wrench when it hits the ground is ____________
Fill in the blank(s) with correct word
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