Sally is having a great time with her new 550 hp Ford Mustang as she drives acro

Question

Sally is having a great time with her new 550 hp Ford Mustang as she drives across South Dakota Part 1: She starts with a low speed of 2.50 m/s. Pressing the accelerator, she smoothly increases her speed. The column on the left shows different acceleration values that she might have. Enter the speed that Sally would have if she accelerated at that given rate for that corresponding amount of time Scenario (n) Acceleration Acceleration Final Speed time rate 2.00 m/s 4.00 s 3.00 m/s 5.00 s 4.00 m/s2 2.00 s 5.00 m/s 3.00s Vf1 V12 V13 Vf4 2 4 Number Number 10.5 m/s 17.5 m/s Number Number Scroll down for more questions. 10.5 m/s V 17.5 m/ s

Explanation / Answer

Form the equation V = U + at, where initial velocity U = 2.5 m/sec is same for all scenarios,

Scenario 1) a = 2 m/sec2, t = 4 sec , So Vf1 = 2.5 + (2*4) = 10.5 m/sec.

Scenario 2) a = 3 m/sec2, t = 5 sec, So Vf2 = 2.5 + (3*5) = 17.5 m/sec.

Scenario 3) a = 4 m/sec2, t = 2 sec, So Vf2 = 2.5 + (4*2) = 10.5 m/sec.

Scenario 4) a = 5 m/sec2, t = 3 sec, So Vf2 = 2.5 + (5*3) = 17.5 m/sec.

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