Question

.. A stone of mass 500 g is thrown vertically upwards
with a velocity of 15 m s. Calculate : (a) the
potential energy at the greatest height, (b) the kinetic
energy on reaching the ground, and (c) the total
energy at its half way point.​

Answer 1

Answer:

56.25J

Explanation:

Kinetic Energy, K.E=0.5×m×v

2

K.E=0.5×0.5×15×15=56.25J

As it has 56.25 J at the initial point as total energy, at some point X,Potential Energy(P.E.) is maximum.

Total energy=P.E.+K.E.

56.25=P.E.+K.E.

As energy is conserved total energy at point X also must be 40 J.

For P.E to be maximum K.E. must be zero.

Hence P.E.=56.25J

We can come to the conclusion that potential energy will have the maximum value at maximum height.