Question

A body moves with constant retardation along a straight line. Which of the given physical quantities of the body decrease during its motion?

(i) Speed
(ii) Velocity
(iii) Displacement

• A. Only (i) and (ii)
• B. Only (ii) and (iii)
• C. Only (i) and (iii)
• D. Only (i), (ii) and (iii)

Answer 1

The correct option is A

Only (i) and (ii)

Step 1: Given Information

1. A body is moving along a straight line with constant retardation.
2. Constant retardation refers to constant deceleration or negative acceleration.

Step 2: Explanation For the correct option

1. As per the definition of acceleration the speed of the body changes with time.
2. So we can say that if the speed decreases uniformly with respect to time then it is said to be constant retardation.
3. In this case, it is given that the body moves in a straight line.
4. so we can say that the velocity of the body decreases with time which gives rise to constant retardation.

Hence,

If a body moves with constant retardation along a straight line, the physical quantities speed, and velocity of the body decrease with time.