While leaning out a window that is 6.4 m above the ground, you drop a 0.60 Determine the following. basketball to a friend at ground level. Your friend catches the ball at a height of 2.0 m above the ground. (a) the amount of work done (in J) by the force of gravity on the ball (b) the gravitational potential energy (in ) of the ball-earth system, relative to the ground when it is released (c) the gravitational potential energy (in J) of the ball-earth system, relative to the ground when it is caught

Calculate the minimum amount of work needed to move a 400 kg rocket from Earth's surface to the International Space Station in orbit 300,000 m above Earths surface. Solve for the minimum amount of work needed to move the payload to the ISS. Start with general equations and explain what you are doing and why you did what you did. Evaluate your solution. Describe how you evaluated your answer and whether or not you think your answer is reasonable.

A ball is launched directly upwards from the ground. At max height, the ball has a gravitational potential energy of 200 J. If the ball the ball has a mass of 4 kg, then what was the initial velocity of the ball? Report your answer in units of meters per second (m/s) but only write down the number part.

A 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?

C7 19.) You reach out the second story window, which is 5 m above the sidewalk, and throw a 0.5 kg ball straight upward with 2 J of kinetic energy. (a) What is the ball's gravitational potential energy when it is released?__________________________ J(b) What is the ball's gravitational potential energy just before hitting the sidewalk?___________________________ J(c) What is the ball's kinetic energy just before hitting the sidewalk?___________________________ J   (d) How would the answer to part c change if the ball had initially been thrown straight down with 2 J of kinetic energy? A.) stay the same B.) decrease     C.) increase

Using energy techniques solve the following problem(s)A firework cannon fires its 0.8 kg payload straight up from a starting height of 1.2 m (which is the length of the cannon) with an initial velocity of 80 m/s.  (a) What is the initial gravitational potential energy of the payload relative to the ground? (b) What is the initial kinetic energy of the payload? (c) When it gets to its highest point, the payload's kinetic energy will have all been converted to gravitational potential energy.  Use this knowledge and your answers from (a) and (b) to calculate the maximum height of the payload using energy techniques (instead of kinematics).  Notice that we are still using the fact that the vertical velocity at its highest point is zero

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A 1,060 kg meteor strikes the surface of the Moon. What is the work done (in J) on the meteor by the gravitational field of the Moon, if we assume the meteor comes from deep space? The work done by the Moon's gravitational field is equal to the negative of the change of potential energy of the meteor-Moon system. You can assume the meteor comes from infinitely far. What is the final distance of the meteor, if it lands on the Moon's surface? You will need to look up two physical characteristics of the Moon to solve this problem. J

An object with a mass of 15kg slides down an incline with a length of 6.0m at an angle of 28 degrees from horizontal.  The coefficient of friction between the object and incline is 0.25  a) How much work does the gravitational force perform on the object? b) How much work does the frictional force perform on the object?  c) What will its speed be as it reaches the bottom of the incline?

A 0.2 kg ball is resting on edge of the top of a 1 m height table. Does the ball have kinetic energy? Explain. Does the ball have potential energy? What is the value of its potential energy? If the ball falls off the table, what happens to its potential energy and kinetic energy during this falling? Which increases/decreases?