A car accelerates uniformly from 10 m/s to 20 m/s in 5 seconds. What is the distance covered by the car during this time?
PhysicsClass 9CBSEAnswered 13 May 2026
Answer
Initial velocity (u) = 10 m/s
Final velocity (v) = 20 m/s
Time (t) = 5 s
First, calculate acceleration (a) using v = u + at:
20 = 10 + a * 5
10 = 5a
a = 2 m/s²
Now, calculate displacement (s) using s = ut + (1/2)at²:
s = (10 * 5) + (1/2) * 2 * (5)²
s = 50 + (1/2) * 2 * 25
s = 50 + 25
s = 75 meters.
Alternatively, using v² = u² + 2as:
20² = 10² + 2 * 2 * s
400 = 100 + 4s
300 = 4s
s = 300 / 4 = 75 meters.
Suggested Q&A
Physics · Class 9- PhysicsClass 9A ball is dropped from a height. Describe its motion in terms of velocity and acceleration, neglecting air resistance.
- PhysicsClass 9Distinguish between instantaneous speed and average speed. When are they equal?
- PhysicsClass 9A car travels from city A to city B at a speed of 40 km/h and returns from city B to city A at a speed of 60 km/h. What is the average velocity of the car for the entire journey?
- PhysicsClass 9Look at the given velocity-time graph. Describe the motion of the object in each segment (OA, AB, BC).
- PhysicsClass 9A car is traveling at 25 m/s. The driver applies the brakes, and the car decelerates uniformly at 5 m/s². How long does it take for the car to stop, and what distance does it cover during this time?
- PhysicsClass 9Does an object in uniform circular motion have acceleration? If yes, in which direction does it act?