Question

A ball of mass 1 kg is thrown from the top of a tower at \(t = 0\) with an initial velocity \(\vec{v} = [10\hat{i} + 20\hat{j}] \, \text{m/s}\). The change in potential energy of the ball between \(t = 0\) and \(t = 5 \, \text{s}\), while it is freely falling, is (Take \(g = 10 \, \text{m/s}^2\)).

• A. -150 J
• B. +50 J
• C. -250 J
• D. -275 J

Hint:

For projectile motion problems, always separate horizontal and vertical components. Potential energy depends only on vertical displacement.

Answer 1

The Correct Option is C