Physics
Assertion (A) : The displacement of a body can be zero even if the distance travelled by it is not zero.
Reason (R) : Displacement is the shortest distance from the initial to the final position of body.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Motion in One Dimension
1 Like
Answer
both A and R are true and R is the correct explanation of A
Explanation
Assertion (A) is true because if a body moves and comes back to its starting point (e.g., in a circular path or a round trip), the displacement is zero because the initial and final positions are the same, but the distance travelled is not zero.
Reason (R) is true because by definition, displacement is the shortest straight line distance between the initial and final positions of the body. So, the reason correctly explains the assertion.
Answered By
1 Like
Related Questions
A car starting from rest accelerates uniformly to acquire a speed 20 km h-1 in 30 min. The distance travelled by car in this time interval will be —
- 600 km
- 5 km
- 6 km
- 10 km
A car starting from rest moves on a straight path for time t = 0 to t = T with a uniform acceleration a and then stops with a uniform retardation. The average speed of the car will be :
aT
Assertion (A) : For a given time interval, average velocity and average speed can have different values.
Reason (R) : Speed is a scalar quantity whereas velocity is a vector quantity.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Assertion (A) : The slope of displacement-time graph gives the velocity.
Reason (R) : Velocity is the product of displacement and time.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false