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## Answers

velocity = displacement / time

Force = rate of change of momentum

Momentum = mass . velocity

Power is rate of work done

Power = work / time

Unit of power is watt

Potential energy (P)

PE = m.g.h

m = mass

g = acceleration due to gravity (9.81m/s )

h = height

Kinetic energy (P)

P = (1/2).m.v

m = mass

v = velocity

Ohm's law

V = I . R

V = voltage applied

R = Resistance

I = current

Electric power (P) = (voltage applied) x (current)

P = V . I = I . R

V = voltage applied

R = Resistance

I = current

OPTICS

Index of refraction

n = c/v

n - index of refraction

c - velocity of light in a vacuum

v - velocity of light in the given material