Use the following to answer questions :
A driver going down a straight highway is traveling at 70 ft/sec on cruise control when he begins accelerating at a rate of 4.2 ft/sec 2 . The final velocity of the car is given by the function , where V(t) is the velocity at time t.
-Determine the velocity of the car after 10.4 seconds.
A) 111.40 ft/sec
B) 112.32 ft/sec
C) 113.68 ft/sec
D) 114.54 ft/sec

Question

Use the following to answer questions :
A driver going down a straight highway is traveling at 70 ft/sec on cruise control when he begins accelerating at a rate of 4.2 ft/sec 2 . The final velocity of the car is given by the function  , where V(t) is the velocity at time t.
-Determine the velocity of the car after 10.4 seconds.
A) 111.40 ft/sec 
B) 112.32 ft/sec 
C) 113.68 ft/sec 
D) 114.54 ft/sec

Quizplus · Accepted Answer

To find the velocity of the car after 10.4 seconds, we need to evaluate V(10.4) using the given function. 
V(t) = 70 + 4.2t 
V(10.4) = 70 + 4.2(10.4) 
V(10.4) = 113.68 ft/sec 
Therefore, the velocity of the car after 10.4 seconds is 113.68 ft/sec, which is answer choice C.

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