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    Work, Energy and Power
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    Two bodies approaching towards each other collide and stick together. What type of collision it is?
    Perfectly inelastic collision.
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    Is work a scalar or a vector quantity?

    Work is dot product of two vectors. i.e. F with rightwards arrow on top times S with rightwards arrow on top.

    And dot product is a scalar quantity. Therefore, work is a scalar quantity. 
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    Define the unit joule.
    Work done is said to be one joule if one newton of  force displaces the body through a distance of one meter in the direction of applied  force .
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    What are different units of energy?

    The different units of energy are :

    (i) Joule            
    (ii) Erg
    (iii) eV            
    (iv) KWh
    (v) Calorie.

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    What type of energy is stored in a stretched bow?
    Potential energy.
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