Amotorist traveling at 12 m/s encounters a deer in the road 39 m ahead. if the maximum acceleration the vehicle’s brakes are capable of is −6 m/s 2 , what is the maximum reaction time of the motorist that will allow her or him to avoid hitting the deer? answer in units of s. 015 (part 2 of 2) 10.0 points if his or her reaction time is 2.56 s, how fast will (s) he be traveling when (s)he reaches the deer? answer in units of m/s.

Explanation:

Given

Motorcyclist speed=12 m/s  

maximum acceleration

distance=39 m

Let x be the distance traveled by motorist in his reaction time

therefore remaining 39-x will be traveled with acceleration

s=39-x

v=0

u=12 m/s

x=27 m

Therefore he traveled 27 m in his reaction time

t=2.25 s

(b)If his reaction time is 2.56 sec

then distance traveled in his reaction time

Remaining distance 39-30.72=8.28 m

therefore its velocity when it reaches the deer

v=6.681 m/s

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide