Two cars A and B are moving in the same direction along a straight… | JEE Main 2026 (4 Apr, Shift 2)

Q1JEE Main 2026 · 4 APR · SHIFT 2Difficult

Relative Velocity

Two cars $A$ and $B$ are moving in the same direction along a straight line with speeds $100\text{ km/h}$ and $80\text{ km/h}$ , respectively such that car $A$ is moving ahead of car $B$ . A person in car $B$ throws a stone with a speed $v$ so that it hits the car $A$ with a speed of $5\text{ m/s}$ . The value of $v$ is $\underline{\qquad}\text{ km/h}$ .

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Answer: (c)

Stone must hit A with $5\text{ m/s} = 18\text{ km/h}$ relative to A, so stone's ground speed $= 100 + 18 = 118\text{ km/h}$ .
Speed relative to B (thrower): $v = 118 - 80 = 38\text{ km/h}$
So the answer is (c) 38.

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Relative Velocity question from JEE Main 2026 (4 Apr, Shift 2)

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