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Class 10 Class 12
A body is projected with kinetic energy 100J at an angle 45° with horizontal. What fraction of kinetic energy will be the potential energy at the highest point?

If a body is projected with kinetic energy K at angle θ, then kinetic energy at highest point is K cos2θ.

Therefore, potential energy of the body at highest point is,

P.E. =

Fractional potential energy at highest point is,

Here, we have

K = 100 J and
Fractional potential energy at highest point is,

At the highest point, K.E will be 0.5 times the P.E at the highest point.
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What is a vector quantity?

A physical quantity that requires direction along with magnitude, for its complete specification is called a vector quantity.
835 Views

What is a scalar quantity?

A physical quantity that requires only magnitude for its complete specification is called a scalar quantity.
1212 Views

What are the basic characteristics that a quantity must possess so that it may be a vector quantity?

A quantity must possess the direction and must follow the vector axioms. Any quantity that follows the vector axioms are classified as vectors.

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Give three examples of scalar quantities.

Mass, temperature and energy
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Give three examples of vector quantities.

Force, impulse and momentum.
865 Views