A body of mass 4 kg is raised from height 2 m to 8 m. Increase in potential energy (g=10) is MCQ with Answer and Explanation

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A body of mass 4 kg is raised from height 2 m to 8 m. Increase in potential energy (g=10) is

A. 240 J

B. 80 J

C. 400 J

D. 320 J

Answer: Option A

Solution (By JKExamLibrary)

ΔPE = mgΔh = 4×10×(8-2) = 4×10×6 = 240 J.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

A car moving with speed 20 m/s applies brakes and stops in 5 s. The distance covered during braking is

A. 200 m

B. 50 m

C. 100 m

D. 25 m

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Correct Answer: Option B

Explanation:
u=20, v=0, t=5, a = (0-20)/5 = -4 m/s². s = ut + ½at² = 20×5 + ½×(-4)×25 = 100 - 50 = 50 m. Or average velocity = (20+0)/2 = 10 m/s, distance = 10×5 = 50 m.

This question belongs to: Science Physics

Question #2 Report Error

Which of the following is an example of a third class lever?

A. Crowbar

B. Seesaw

C. Scissors

D. Fishing rod

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Correct Answer: Option D

Explanation:
In third class lever, effort between fulcrum and load. Fishing rod, tweezers, forearm. Scissors first class, crowbar first/second, seesaw first. Mechanical advantage

This question belongs to: Science Physics