Physics · Motion in one Dimension

JEE Main 2026 — 4 April, Evening Shift — Question 2

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 $\underline{\hspace{2cm}}$ km/h.

Option A:
18
Option B:
28
Option C:
38
Correct
Option D:
48

Answer: C

Step-by-step solution

Relative speed of stone w.r.t B = v, w.r.t ground = v + 80 km/h. Relative to A = (v+80)-100 = v-20 km/h = 5 m/s = 18 km/h ⇒ v = 38 km/h

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Exam: JEE Main 2026
Paper: 4 April, Evening Shift
Subject: Physics
Chapter: Motion in one Dimension
Topic: Uniformly Accelerated Motion

At t=0, mass 100g starts moving under force (5i+10j) N. After 2s position is (2x i + 5y j) m. Ratio x:y?

Answer: C

Step-by-step solution

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