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Motion in Straight Line
Question
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A body is projected with velocity less than escape velocity. What is the sign of total energy at:

(i) surface of the earth,

(ii) the highest point?

Answer

(i) Total energy at the surface of the Earth is negative.
(ii) Total energy at the highest point is negative. 
Energy is negative because it is due to the attractive gravitational potential force exerted by earth on the body. 

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Some More Questions From Motion in Straight Line Chapter

Is absolute rest or absolute motion possible?

What is the most essential thing to study the motion of a body?

Can a body be always at rest in some frame?

Can a body be in motion in the frame associated with the body itself?

When an object in motion can be considered as particle or point object?

Can you think of physical phenomena involving the moon in which moon cannot be treated as particle?

A train is crossing the bridge. Can it be taken as a particle?

Can a train be taken a particle? Give an example in support of your answer.

 A particle is moving along curved line in space. Is the motion one dimensional?

State which of the following are examples of one, two or three dimensional motion: 

(a) A kite flying in the sky.

(b) The earth revolving around the sun. 

(c) A train moving along the equator of the earth in clockwise direction. 

(d) Accelerated motion of a particle in a straight line.