A ball is thrown vertically downward with a velocity of 20 m/s from the top of a tower. It hits the ground after some time with a velocity of 80 m/s. The height of the tower is : (g = 10 m/s^2)

1. 360 m

2. 340 m

3. 320 m

4. 300 m

Doubtly Asked 30 Oct 2026 NEET UG 2020 Practice test neet Save WhatsApp Report

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Answer: 4. 300 m

Use $v^2=u^2+2gh$ (downward motion, $g$ positive).

$$h=\frac{v^2-u^2}{2g}=\frac{80^2-20^2}{2\times10}=\frac{6400-400}{20}=300\ \text{m}$$

Answer: option 4.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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