The velocity of an object in motion changed from +2 m/s to –5 m/s. Which of the following statements is true regarding the object?

All the above

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Its kinetic energy decreased.

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Its speed reduced.

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Its direction of motion changed.

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Solution

The correct option is D Its direction of motion changed.
The positive or negative sign in velocity represents the direction of velocity. Kinetic energy is independent of the direction of velocity as it is proportional to the square of velocity.

Since velocity is a vector quantity, it changes when its direction changes. The direction of motion of an object is the same as the direction of its velocity.

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