An object is moving with variable speed, then

Its velocity may be zero

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Its velocity must be variable

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Its acceleration may be zero

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Its velocity must be constant

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Solution

The correct option is B Its velocity must be variable
Velocity means $i n s t a n t a n e o u s$ velocity which is nothing but direction + magnitude of $s p e e d$ at that instant.
So velocity $m u s t$ be $v a r i a b l e .$
Acceleration can't be zero as the $m a g n i t u d e$ of velocity is changing.

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

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Similar questions

Mark the correct statement(s)
(1) If speed of a body is varying, its velocity must be varying and it must have non-zero acceleration.

(2) If velocity of a body is varying, its speed must be varying.

(3) A body moving with varying velocity may have constant speed.

(4) A body moving with varying speed may have constant velocity, if its direction of motion remains constant.

Q. If the net unbalanced external force acting on an object is zero, then the
(A) Velocity of the object may or may not be zero
(B) Acceleration of the object must be zero
(C) Velocity of the object must be non-zero
(D) Acceleration of the object must be a non-zero constant
Choose the correct option:

When the speed is constant the velocity may not be constant but when the velocity is constant the speed must be constant.why this happens?

Read each statement below carefully and state with reasons and examples, if it is true or false;
A particle in one-dimensional motion
a) with zero speed at an instant may have non-zero acceleration at that instant
b) with zero speed may have non-zero velocity,
c) with constant speed must have zero acceleration,
d) with positive value of acceleration must be speeding up.

Q. Read each statement below carefully and state with reasons and examples, if it is true or false:
A particle in one-dimensional motion
(a) with zero speed at an instant may have non-zero acceleration at that instant.
(b) with zero speed may have non-zero velocity.
(c) with constant speed must have zero acceleration.
(d) with positive value of acceleration must be speeding up.

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