A book self is 1 metre above the floor. As a book falls from the shelf to the floor it loses 7.5j of gravitational potential energy. How much kinetic energy does the book have just before it hits the floor?

moving ball hits still ball. mover stops, hit ball moves. momentum transfer.

when cloud cover increases then the suns ray's which provides the earth with light and warmth gets covered due to the due to the suns ray's being blocked, the temperature in that region

therefore to conclude i would like to say that,

=more the cloud cover, the lesser the

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the components of a vector are the parts of the vectors that are to each other.

b perpendicular

snell's law

refractve index = sin incidence / sin refraction