MEDAL GIVEN TO BEST ANSWER.
A bicyclist is going 7 m/s. He squeezes the brakes, giving him an acceleration of 1.2 m/s2. How fast is the bicyclist going after 3 seconds of applying the brakes?

A. 3.6 m/s
B. 10.4 m/s
C. 3.4 m/s
D. 10.6 m/s

Question

MEDAL GIVEN TO BEST ANSWER. 
A bicyclist is going 7 m/s. He squeezes the brakes, giving him an acceleration of 1.2 m/s2. How fast is the bicyclist going after 3 seconds of applying the brakes?

 		A.	3.6 m/s
 		B.	10.4 m/s
 		C.	3.4 m/s
 		D.	10.6 m/s

anonymous · Answer

Please wait while I solve the problem

anonymous · Answer

Are you familiar with the formula $$v_x=v _{0x}+ at$$

anonymous · Answer

Please note that, in this problem, acceleration is negative because the bicyclist is slowing down.

$$v_x=7-1.2(3) = 3.4$$ 

make sure to use the correct order of operations i.e. PEMDAS()

anonymous · Answer

So the correct answer should be C.

anonymous · Answer

Thanks!