Question

In the above problem, the kinetic energy at the highest point for the second ball is K. What is the kinetic energy for the first ball

• A. 4 K
• B. 3 K
• C. 2 K
• D. Zero

Answer 1

Answer: (D)

Zero

Answer 2

KE at the highest point $KE = \frac{1}{2}mu^{2}\cos^{2}\theta$

For first ball θ = 90⁰ ∴ KE = 0