Question

7.An object P is moving with a constant velocity for 5 mins. Another object Q is moving with changing velocity for 5 mins. Out of these two objects , which one has acceleration ? Explain.

Answer 1

Answer:

An object is moving with variable speed, then 

A .

Its velocity may be zero

B .

Its velocity must be variable

C .

Its acceleration may be zero

D .

An object is moving with variable speed, then 

A .

Its velocity may be zero

B .

Its velocity must be variable

C .

Its acceleration may be zero

D .

Its velocity must be constant

ANSWER

Velocity means instantaneous velocity which is nothing but direction + magnitude of speed at that instant.

So velocity  must  be variable. 

Acceleration can't be zero as the magnitude of velocity is changing. 

So, the correct answer is 'Its velocity must be variable'.