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looi76
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Homework Statement
A car pf mass 900kg accelerates from rest to a speed of 20 ms^-1 whilst moving 80m along a horizontal road. Find the tractive force (i.e. the driving force) exerted by the engine, assuming that it is constant and that there is a constant resistance to motion of 250N.
Homework Equations
The Attempt at a Solution
m = 900kg, u=0ms^-1 , v=20ms^-1, s = 80m
acceleration = (20-0)/2 = 10ms^-2
force = ma = 900*10 = 9000N
workdone = 7.2*10^5J
What about the constant resistance to motion of 250?