Question

Jim is playing with a 1-meter-long pendulum that is hooked

2 meters above the ground. He lifts the pendulum's 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?

Answer 1

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

Explanation:

i took the test on PLATO and it was correct

Answer 2

i will help up you using these statements which I took for the same problem:

a) at the lowest position of the bob, the KE is equal to zero.

FALSE BECAUSE AT THE LOWEST POSITION THE PE IS THE LOWEST AND THE KE IS THE HIGHEST.

b) at the highest position of the bob, the PE is equal to zero.

FALSE BECAUSE AT THE HIGHEST POSITION THE PE IS THE HIGHEST

c) at the highest position of the bob, the KE is equal to zero.

TRUE: AT THE HIGHEST POSITION THE PENDULUM COMES TO ZERO SPEED AND SO THE KE IS ZERO.

d) at all the positions except the highest positions the PE is zero.

FALSE: THE PE ENERGY CHANGES WITH THE ALTITUDE AND IS ZERO ONLY AT THE BASE LEVEL.