Question

When a shot-put champion releases a 5.0 kg shot, it is at 1.5m above the ground and traveling at 10 $\frac{m}{s}$. It reaches a maximum height of 5m above the ground. What are the total mechanical energy, kinetic energy, and potential energy of the shot at its maximum height?

• A. 325 J, 75 J, 250 J
• B. 450 J, 125 J, 325 J
• C. 300 J, 100 J, 200 J
• D. 350 J, 125 J, 225 J

Answer 1

The correct option is A

325 J, 75 J, 250 J

Substituting the values of mass, height and velocity of the shot in the formula:
Total energy = Potential energy + Kinetic energy = m $\times$ g $\times$ h + $\frac{1}{2}$ m $v^2$ = 325 J
The total mechanical energy will remain the same through out the flight.
Now, Potential energy = mgh = (5 $\times$ 10 $\times$ 5) = 250 J and Kinetic energy = 325 J - 250 J = 75 J