A ranger in a national park is driving at 36.2mi / h when a deer jumps into the road 205 ft ahead of the vehicle. After a reac tion time of t the ranger applies the brakes to produce and acceleration of - 8.83ft / (s ^ 2) What is the maximum reaction time al lowed if she is to avoid hitting the deer ? Answer in units of s. Need help ASAP please

Explanation:

Given that,

Initial speed of a ranger, u = 36.2 mi/h

Distance dove by the ranger, d = 205 ft

Due to the application of brakes, the acceleration reached is 8.83 ft/s².

We need to find the maximum reaction time allowed if she is to avoid hitting the deer.

We know that,

1 mph = 1.46667 ft/s

36.2 mi/h = 53.09 ft/s

Let t is time.

Using second equation of kinematics to find it as follows :

The above is a quadratic equation. We need to solve it for t as follows :

Hence, 416.01 seconds is the maximum reaction time allowed if she is to avoid hitting the deer.

a and b sometimes have a positive value

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.