JEE Mains · Physics · STD 11 - 2. motion in straight line
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.
- A \(18\)
- B \(28\)
- C \(38\)
- D \(48\)
Answer & Solution
Correct Answer
(C) \(38\)
Step-by-step Solution
Detailed explanation
Velocity of car A, \(v_A = 100\) km/h Velocity of car B, \(v_B = 80\) km/h Velocity of the stone relative to car B is \(v\). The velocity of the stone relative to the ground is \(v_S = v_B + v = 80 + v\). The velocity of the stone relative to car A is…
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