select the correct answer. jim is playing with a 1 - meter - long pendulum that is hooked 2 meters above the…

select the correct answer. jim is playing with a 1 - meter - long pendulum that is hooked 2 meters above the ground. he lifts the pendulums bob to a height of 2 meters above the ground and then releases it. potential energy is assigned zero value at the ground level. which statement is true about this problem? a. at the lowest position of the bob, the ke is equal to zero. b. at the highest position of the bob, the pe is equal to zero. c. at the highest position of the bob, the ke is equal to zero. d. at all the positions except the highest positions, the pe is zero.

select the correct answer. jim is playing with a 1 - meter - long pendulum that is hooked 2 meters above the ground. he lifts the pendulums bob to a height of 2 meters above the ground and then releases it. potential energy is assigned zero value at the ground level. which statement is true about this problem? a. at the lowest position of the bob, the ke is equal to zero. b. at the highest position of the bob, the pe is equal to zero. c. at the highest position of the bob, the ke is equal to zero. d. at all the positions except the highest positions, the pe is zero.

Answer

Brief Explanations:

Kinetic energy (KE) is related to the motion of an object. At the highest - point of the pendulum's swing, the bob momentarily stops before changing direction. So its velocity is zero. Since $KE=\frac{1}{2}mv^{2}$ and $v = 0$ at the highest point, the KE is zero. Potential energy (PE) is maximum at the highest point and zero at the lowest point (ground - level in this case).

Answer:

C. At the highest position of the bob, the KE is equal to zero.