Question

A physical quantity which cannot be negative is 

a. displacement
b. Velocity
c. Distance

Acceleration is a vector quantity, which indicates that its value *

(a) Is always negative
(b) Is always positive
(c) Is zero
(d) Can be positive, negative or zero​

Answer 1

Answer:

1. Distance
2. Can be positive, negative or zero

Explanation:

• The physical quantity which can not be negative is distance.

⇒ Distance is a scalar quantity which has only magnitude but no direction. Distance never decreases with time, it always increases. Hence, it is always positive.

⇒ Displacement is a vector quantity having both magnitude and direction.

Suppose, you move in the forward direction with reference to the initial position, then the displacement is taken as positive. And if you move in the backward direction, then it is taken as negative.

⇒ Velocity is also a vector quantity having both magnitude and direction. Hence, it can be negative, positive or zero.

• Acceleration is a vector quantity, which indicates that its value can be positive, negative or zero.

⇒ When an object is moving with uniform velocity, then the acceleration is zero.

⇒ When the velocity of the object increases with time, the acceleration is positive.

⇒ Similarly, when the velocity of the object decreases with time, the acceleration is positive.