in suv of which the total mass is 800 kg is travelling with an initial velocity of 200m/s suddenly observe a stationary dog 50m ahead along its path if the driver exerts a break of 2000N,what would happen?
a = -2000/800 = - 2.5 m/s^2
v = Vi + a t
0 = 200 - 2.5 t
t = 80 seconds to stop
average speed during stop = 100 m/s
so
travels 8 km during stop
I think your initial speed is a typo.