Two cars A and B are moving in the same direction along a straight line with speeds 100 km/h and 80 km/h

Question

Two cars A and B are moving in the same direction along a straight line with speeds 100 km/h and 80 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 m/s. The value of $v$ is ______ km/h. [2026]

Smart Achievers · Accepted Answer

(3)

$The velocity of stone w.r.t to ground is (80 + v) km/hr$ $and velocity w.r.t car A,$

$(80 + v - 100) = \frac{5 \times 18}{5} \Rightarrow v = 38 km/hr$

Solution

1 18

2 28

3 38

4 48

Ans.
(3)

$The velocity of stone w.r.t to ground is (80 + v) km/hr$ $and velocity w.r.t car A,$

$(80 + v - 100) = \frac{5 \times 18}{5} \Rightarrow v = 38 km/hr$

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