detailed soln

Question

• 

Answer 1

i) for min time the car should use max acceleration and now car will travel 40+40+3+17=100m 

using newtons 2nd eqn 

100=v(rel)t=1/2at²

100=0+t²/4 

t=20s 

ii) Total distance travelled by car = S = 100 + 20*20 = 500m

iii) The final speed of the car

v = u+at

v = 20+0.5*20 = 30 m/s