change 50km/hr to m/s
50km/hr*1hr/3600sec*1000m/km
then distance=speed*time
time to stop:
vf=vi+at where a=-1.5m/s^2, vf=0, vi is above speed in m/s
Ann is driving down a street at 50 km/h. suddenly a child runs into the street. if it takes ann .75 seconds to react and apply the brakes. how many meters will ann have moved before she begins to slow down? If she slows down at a rate of 1.5m/s^2, how long will it take her to stop?
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