NEET Physics: Relative Velocity Practice Questions
8 free multiple-choice questions on Relative Velocity (Kinematics) for NEET Physics, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. Two trains are moving in the same direction at speeds of 60 km/h and 40 km/h respectively. What is the relative velocity of the first train with respect to the second train?
Show answer & explanation
Correct answer: B — 20 km/h
Since both trains are moving in the same direction, the relative velocity is the difference between their speeds: 60 km/h - 40 km/h = 20 km/h.
Q2. A boat is moving in a river with a velocity of 5 m/s relative to the water. The river current flows at 2 m/s. What is the resultant velocity of the boat relative to the bank (ground)?
Show answer & explanation
Correct answer: C — 7 m/s
When velocities are in the same direction, they add up. The velocity of the boat relative to the bank is the vector sum of its velocity relative to the water and the velocity of the water relative to the bank. Resultant velocity = 5 m/s + 2 m/s = 7 m/s.
Q3. A man is walking upstream (against the current) in a river flowing at 5 m/s. If the man walks at a speed of 3 m/s relative to the water, what is his speed relative to the bank of the river?
Show answer & explanation
Correct answer: A — 8 m/s
When moving upstream, the velocity of the man relative to the water is 3 m/s, and the velocity of the water relative to the bank is 5 m/s. The speed relative to the bank is the sum: 3 m/s + 5 m/s = 8 m/s.
Q4. An object is observed to be moving with a velocity of 10 m/s in the x-direction. If the velocity of the observer is 2 m/s in the x-direction, what is the velocity of the object as observed by the observer?
Show answer & explanation
Correct answer: A — 8 m/s
This is a simple subtraction problem for relative velocity in one dimension. The velocity of the object relative to the observer is v₍object/observer) = v₍object) - v₍observer) = 10 m/s - 2 m/s = 8 m/s.
Q5. A swimmer can swim at a speed of 4 m/s in still water. If the river flows at 2 m/s, what is the resultant velocity of the swimmer relative to the bank?
Show answer & explanation
Correct answer: A — 6 m/s
Since the swimmer is moving in still water and the water is flowing, the resultant velocity is the vector sum of the swimming velocity and the river flow velocity. Vᵣₑₛᵤₗₜₐₙₜ = 4 m/s + 2 m/s = 6 m/s.
Q6. Particle P moves with a velocity of 10 m/s in the positive x-direction. If the observer is moving with a velocity of 4 m/s in the same direction, what is the velocity of particle P relative to the observer?
Show answer & explanation
Correct answer: B — 6 m/s
Relative velocity is calculated by subtracting the observer's velocity from the particle's velocity. V₍P/O) = V_P - V_O = 10 m/s - 4 m/s = 6 m/s.
Q7. A particle moves along the x-axis with a velocity vₓ = 5 m/s. If the particle moves in the positive direction, what is its velocity relative to a stationary observer on the x-axis?
Show answer & explanation
Correct answer: D — 5 m/s
If the particle is moving along the x-axis with velocity vₓ = 5 m/s and the observer is stationary on that axis, the relative velocity is simply the particle's velocity, 5 m/s.
Q8. Two cars are moving in opposite directions. Car A moves east at 50 km/h and Car B moves west at 30 km/h. What is their relative speed?
Show answer & explanation
Correct answer: B — 80 km/h
When objects move in opposite directions, their relative speed is the sum of their individual speeds: 50 km/h + 30 km/h = 80 km/h.
Keep going — practice on Padhai Karlo
Padhai Karlo gives you unlimited NEET practice: chapter-wise questions, timed quizzes, and full mock tests with an All-India Rank — free to start.
Get the free Android app →