Answered

A bob of mass of 0.18 kilograms is released from a height of 45 meters above the ground level. What is the value of the kinetic energy gained by the bob at the ground level?


250 joules


51 joules


79 joules


8.1 joules

Verified Answer :

Answer: 79 J

Explanation:

The value of the kinetic energy at the bottom would be equal to the value of potential energy at the top. This comes from the conservation of energy. At the top, the bob of mass just has potential energy due to its position. At the bottom, potential energy converts entirely to kinetic energy due to its motion.

It is given that mass of the bob is, m = 0.18 kg

height from which it is dropped is, h = 45 m

acceleration due to gravity, g = 9.8 m/s²

Thus, K.E. = P.E. = m g h = 0.18 kg× 45 m × 9.8 m/s² = 79 J

Answer:

c:79 joules

Explanation:

I took the test on PLATO and it was correct

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