a 1000kg car is travelling with a speed of 33.3m/s2 when the driver saw an intersection 30m away. how much force is needed to stop the car right away?

Answer 1

Suspect speed is 33.3 m/s

average speed during stop = 33.3/2 =16.65

time to stop = t = 30/16.65 = 1.80 s

d = .5 a t^2
30 = .5 a 1.8^2
so
a = 18.5 m/s^2
so
F = m a = 1000*18.5 = 18,500 Newtons