A car moving at 36 km/h is brought to rest in 2 s. Deceleration is MCQ with Answer and Explanation

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A car moving at 36 km/h is brought to rest in 2 s. Deceleration is

A. 10 m/s²

B. 5 m/s²

C. 18 m/s²

D. 2.5 m/s²

Answer: Option B

Solution (By JKSSB Mock Tests)

36 km/h = 10 m/s. a = (0-10)/2 = -5 m/s², magnitude 5 m/s².

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Question #1

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A 2 kg mass moving at 4 m/s collides elastically with a stationary 2 kg mass. After collision, first mass

A. Moves with 1 m/s

B. Rebounds with 4 m/s

C. Moves with 2 m/s

D. Stops

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Correct Answer: Option D

Explanation:
Equal masses elastic collision: velocities swap. Moving mass stops, stationary moves with 4 m/s.

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Question #2

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Resistance of wire: R = ρL/A. If length tripled and area doubled, new R is:

A. 3R

B. R/6

C. 6R

D. 1.5R

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Correct Answer: Option D

Explanation:
R' = ρ(3L)/(2A) = (3/2)(ρL/A) = 1.5R. Resistance scales directly with length, inversely with area. Memory aid: 'R ∝ L/A; changes multiply'. Proportional reasoning problem testing resistance formula, frequently appearing in competitive electricity sections.

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