Acceleration 7071

A tractor travels along a straight road at a speed of 15 m/s. The tractor driver starts braking with an acceleration of 2 m/s2. Specify

a) the magnitude of the speed and the path of the tractor in 5 s from the moment it started to brake
b) the time for which he stops.

Correct answer:

v =  5 m/s
s =  50 m
t2 =  7.5 s

Step-by-step explanation:

v1=15 m/s v2=0 m/s a=2 m/s2 t1=5 s  v=v1+a t1=15+(2) 5=5 m/s
s=v1 t1+21 a t12=15 5+21 (2) 52=50 m
t2=(v2v1)/a=(015)/(2)=7.5 s



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