A 0.400-kg particle has a speed of 1.90 m/s at point circled A and kinetic energy of 7.10 J at point circled B. (a) What is its kinetic energy at ? J (b) What is its speed at ? m/s (c) What is the net work done on the particle by external forces as it moves from to?
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- At the instant it leaves the player’s hand after a jump shot, a0.62-kg basketball is traveling 8.4 m>s. When it passes through thehoop its speed is 6.8 m/s. (a) How much work has gravity done onthe ball? (b) What is the vertical component of the ball’s displacement? (c) If the magnitude of the total displacement of the ball is4.6 m, what is the angle between the displacement vector and thegravitational force?A 70.00 kg jumper leaves the ground with a vertical velocity of 5 m/s. b.) What is his max potential energy during this jump?(a) What force must be supplied by an elevator cable to produce an acceleration of 0.800 m/s2against a 200-N frictional force, if the mass of the loaded elevator is 1500 kg? (b) How much work is done by the cable in lifting the elevator 20.0 m? (c) What is the final speed of the elevator if it starts from rest? (d) How much work went into thermal energy?
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