raney10 raney10

23-01-2017
Physics

Answered

A car rolls along a surface with a coefficient of friction of .795 I f the car has a mass of 905 kg, what force is needed to accelerate the car from rest to 102.5 km/hr in 10 sec?

Verified Answer :

scme1702 scme1702

30-01-2017

102.5 km/hr = 28.5 m/s
a = (28.5 - 0) / 10
a = 2.85 m/s²

Resultant force = forward force - friction
ma = F - μmg
F = ma + μmg
F = 905(2.85 + 0.795 x 9.81)
F = 9637.3 N
F = 9600 N

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