# physics

A net force of 5000.0 N accelerates a car from rest to 93.3 km/h (meter per second) in 4.1s (a)what is the mass of the car? (b) What is the weight of the car?

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1. F=MA----(1)
where F=force=5000N
M=mass of car
A=acceleration

1st)calculate acceleration.
A=speed/time-------(2)
(dont forget to convert speed into m/s)

2nd) replace A in (1), and solve for M :)

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posted by Henry
2. a. V = 93.3km/h = 93,300m/3600s = 25.92 m/s

a=(V-Vo)/t = (25.92-0)/4.1 = 6.32 m/s^2.

m = F/a = 5000/6.32 = 791.1 kg.

b. m*g = 791.1kg * 9.8N/kg = 7753 N. =
Wt. of car.

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posted by Henry

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