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Class 10 Class 12

The velocity of a projectile at the initial point A is (2 i + 3 j) m/s. Its velocity (in m/s) at point B is,

• -2 i - 3 j

• -2 i + 3 j

• i - 3 j

• i + 3 j

C.

i - 3 j

From the fig,, the X component remain unchanged, while the Y-component is reverse. Then, the velocity at point B is (2 i - j) m/s.

From the fig,, the X component remain unchanged, while the Y-component is reverse. Then, the velocity at point B is (2 i - j) m/s.

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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.
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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 vector quantities.

Force, impulse and momentum.
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What is a scalar quantity?

A physical quantity that requires only magnitude for its complete specification is called a scalar quantity.
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Give three examples of scalar quantities.

Mass, temperature and energy
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