Question

Will the final speed of each of the balls be same before hitting the ground if they are thrown from same height h with same initial speed?

• A. Yes
• B. No

Answer 1

Answer: (A)

Yes, the final speed will be the same

Answer 2

Using energy conservation, we have:

$$mgh + \frac{1}{2}mu^2 = \frac{1}{2}mv^2$$

Thus,

$$v = \sqrt{u^2 + 2gh}$$

Since $u$ (the initial speed) and $h$ are the same for all balls, all balls will have the same final speed, regardless of the direction in which they were thrown.