Question Detail
Question
A tennis ball was projected horizontally with initial velocity 30 m/s from a height of 80 m. Find the time of motion. (g = 10 m/s²).
Correct Answer
Option D is the correct answer.
Detailed Explanation
For vertical motion: h = ½gt², so t = √(2h/g) = √(2×80/10) = √16 = 4 s.
Hint
Time of flight depends only on vertical drop.