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  • Which of the following statement is not correct for an object moving along a straight path in an accelerated motion: (a) Its speed keeps changing (b) Its velocity always changes

Which of the following statement is not correct for an object moving along a straight path in an accelerated motion?

(a) Its speed keeps changing
(b) Its velocity always changes
(c) It always goes away from the earth
(d) A force is always acting on it

Answers (1)

Ans. c

Sol.

By the knowledge of kinematics, we can say that acceleration changes velocity of any moving object.
Velocity is a vector quantity, which has direction and magnitude.
Magnitude of velocity is called speed, and if speed is changing that means velocity is also changing.

Therefore, for any object moving on a straight line with acceleration will have changing speed or velocity.

By Newton’s second law, acceleration is the effect caused by force hence force must be acting on the body.
For going away from Earth, the net force on the body must be more than Mg. The force must be in vertically upward direction also.

Hence by using the given information, we can say that the body needs not to go away from Earth.

Hence, the correct option is C

Posted by

Gurleen Kaur

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