Energy techniques

Energy techniques.

1.50 kg snowball is fired from a cliff 12.5 m high. The snowball’s initial velocity is 14.0 m/s,directed 41.0o above the horizontal. (i) (a) How much work is done on the snowball by thegravitational force during its flight to the flat ground below the cliff? (b) What is the change in thegravitational potential energy of the snowball–Earth system during the flight? (c) If that gravitationalpotential energy is taken to be zero at the height of the cliff, what is its value when the snowballreaches the ground? (ii) (a) Now for the same data given above, using energy techniques, find thespeed of the snowball as it reaches the ground below the cliff. What is that speed (b) if the launchangle is changed to 41.0o below the horizontal and (c) if the mass is changed to 2.50 kg?

Energy techniques

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