What is the average speed if a person is fu cking with a speed of 15km/h ant t1 and 13km/h at t2?
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in which Class did you Learn ! your Physics Already ? And why now start worrying about Average ? going by ur public display of Questions , u should know the formulae for Acceleration . isn't it ?
anyhow : to distract others from your type of Physics ,here is synopsis of wht may help in Life .
S = So + ut + 12/at^2.
v = u + at
Vav = ( v+u)/2.
a = (v-u)/t
F = m a
torque = FXL
work done = F.S Cos theta.
power = Work/time
Energy = Power x Time.
and Momentum = M V = P
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