Question

A ball is thrown upwards from a point A. it reaches up to the highest point B and returns.
Potential energy at A = kinetic energy at B
Potential energy at A = potential energy at B
Potential energy at A = kinetic energy at A
Kinetic energy at A = kinetic energy at B

I selected the last option am I correct and if not why not ??

Answer 1

Explanation:

In my opinion option 1 is correct.

At point A, V is max so K.E = max and h=0 i

so P.E=0

At point B

V=0 ,so K.E=0 and P.E = max ii

as mechanical energy is conserved at both places

( K.E+P.E)A=( K.E+P.E)B

K.E atA =P.E at B from equation 1 and 2

we can say K.E at A=P.E at B

we can modify it as

Potential energy at A = kinetic energy at B

as P.E at A=kinetic energy at B=0