Answer:
option (C)
Explanation:
Speed of car = 30 m/s
Let the time taken by the police car to catch the speeding car is t
The distance traveled by the speeding car in t + 1 second is equal to the distance traveled by the police car in time t
Distance traveled by the police car in time t
.... (1)
Distance traveled by the speeding car in t + 1 second
s = 30 (t + 1) = 300
t + 1 = 10
t = 9 s
Put the value of t in equation (1), we get
300 = 0 + 0.5 x a x 9 x 9
a = 7.41 m/s^2
Answer:
Explanation:
Given that the operating cost is
cents per mile
total miles covered is given as
so total cost of drive is given as
$
time taken by the truck to move the distance is given as
So total earnings of the driver is given as
$
now total profit of the driver is given as
$
to maximize the profit we have
so we have