A body is thrown vertically upward with speed 40 m/s. Distance travelled in last second of ascent (g=10) MCQ with Answer and Explanation

Question

Share Report Error

A body is thrown vertically upward with speed 40 m/s. Distance travelled in last second of ascent (g=10)

A. 35 m

B. 5 m

C. 15 m

D. 20 m

Answer: Option B

Solution (By JKSSB Mock Tests)

Time of ascent = u/g = 4 s. Distance in last second (4th) = ½g(1)²? Actually, during last second of upward journey, velocity becomes zero. Distance = ½g(1)² = 5 m. Formula: s = u - g/2 (2n-1) with n=4? Let's compute: s_nth = u - (g/2)(2n-1). For n=4 (4th second), s = 40 - 5×7 = 40 - 35 = 5 m. Yes.

This question belongs to: Science Physics

Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Physics Questions

Question #1

Share Report

The velocity of a body changes from 2 m/s to 10 m/s in 4 s. Distance covered in this time is (assuming constant acceleration)

A. 24 m

B. 48 m

C. 32 m

D. 16 m

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option A

Explanation:
a = (10-2)/4 = 2 m/s². s = 2×4 + ½×2×16 = 8+16=24 m. Or average velocity 6 m/s ×4=24.

This question belongs to: Science Physics

Question #2

Share Report

A typical household refrigerator works by forcing a refrigerant fluid through a cycle of:

A. Ionization and recombination

B. Evaporation and condensation

C. Sublimation and deposition

D. Nuclear fission and fusion

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
A refrigerator is a heat pump operating in reverse. A compressor squeezes the refrigerant gas, raising its temperature. As it passes through coils on the back (condenser), it releases heat and condenses into a liquid. This liquid expands through a valve, cooling rapidly, and flows into the evaporator coils inside the fridge, where it absorbs heat from the food and evaporates back into a gas.

This question belongs to: Science Physics