What is the efficiency of the
machine if the input is 263 J and
the output is 142 J?

How much work is done lifting a 9.10 kg box straight up onto a shelf that is 1.80 m high?

Use the table to answer question 22 23 and 24.

Amodel rocket with a mass of 0.212 kg is launched into the air with an initial speed of 84 m/s. how much kinetic energy will the rocket have at a height of 214 m? assume there is no wind resistance. 634 j 303 j