11) a 0.2 kg apple on an apple tree has a potential energy of 10 j. it falls to
the ground, converting all of its pe to kinetic energy. what is the velocity
of the apple just before it hits the ground?
now choose from one of the following options why?
om/s
2 m/s
10 m/s
50 m/s
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Ответ:
Ответ:
A rock is tied to a string and swung inner circle at a constant speed of 4 m/s. if the rock feels a centripetal acceleration of 5 m/s^2. what is the length of the string?
Answer :
C. 1.25 m