A ball is thrown straight up into the air. At what position is its kinetic energy a maximum? At what position is the gravitational potential energy of the ball–Earth system a maximum?
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A ball is thrown straight up into the air. At what position is its kinetic energy a maximum? At what position is the gravitational potential energy of the ball–Earth system a maximum?
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- An apple in a tree has a mass of 0.20 kg. If it is 2.8 meters above the ground, how much potential energy does it have? Round to the nearest whole numberA 20 N ball is thrown upward with an initial kinetic energy of 100 J. How much gravitational potential energy will the ball have when it reaches the top of its path? 2000 J 100 J 50 J 5 J Which is correct?A box with a mass of 7.0kg is lifted very slowly (with essentially zero acceleration), though a height of 1.5m, in order to place it upon the shelf of a closet. What is the increase in potential energy of the box? How much work was required to lift the box to this position?
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- An athlete throws a 1.5 kg ball with a horizontal speed of 9 m/s, from a height of 4.8 metres above the ground. a) Calculate the kinetic energy, gravitational potential energy and total mechanical energy of the ball at its starting position. b) Calculate the maximum speed attained by the ball, just as it reaches the ground's surface.Point Height (y) (m) Speed (v) (m/s) Potential Energy (J) Kinetic Energy (J) Mechanical Energy (round off to the nearest thousands) A 8 m 0 m/s 3430 J 0 J 3000 J B 3 m 8.8 m/s 1470 J 1936 J 3000 J C 2 m 9.9 m/s 980 J 2450 J 3000 J - Calculate the ratio of the mechanical energy at B and mechanical energy at A (EB/EA) and (EC/EB). What do these ratios tell you about the conservation of energy? - Is the mechanical energy conserved between A and B? Explain. - Is the mechanical energy conserved between B and C? Explain