A ball is projected horizontally from top of a cliff. The time to hit ground depends on MCQ with Answer and Explanation

A ball is projected horizontally from top of a cliff. The time to hit ground depends on

A. Height of cliff and g

B. Mass of ball

C. Both velocity and height

D. Horizontal velocity

Answer: Option A

Solution (By JKExamLibrary)

Vertical motion is independent of horizontal. t = √(2h/g). Mass doesn't affect. Horizontal velocity affects range, not time of fall. Projectile motion independence of perpendicular components.

This question belongs to: Science Physics

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Question #1 Report Error

A 10 kg object is falling freely under gravity. The net force acting on it is (g=10)

A. 10 N

B. 0 N

C. 1 N

D. 100 N

View Answer & Solution Discuss

Correct Answer: Option D

Explanation:
Weight = mg = 10×10 = 100 N. In free fall, only force is gravity (air resistance neglected). Net force = weight, so F = 100 N, causing acceleration g.

This question belongs to: Science Physics