Home I Studentb Class Management I Help Hw#9 Begin Date: 9/17/2018 12:01:00 AM .

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Home I Studentb Class Management I Help Hw#9 Begin Date: 9/17/2018 12:01:00 AM .. Due Date: 9/19/2018 10 00 00 AM End Date: 9/19/2018 10:00 00 AM 70%) Problen 2: The velocity as a function of time for a world-class track sprinter in a 100 m race is shown in the figure. The sprinter accelerates for the first 4.0 seconds, and then runs at a constant velocity until the end of the race. Sprinter Velocity vs Time 0.0 2.0 4.0 6.0 8.0 100 6.0 12 12 12 12 Tme ( Otheexpertta.com 25% Part (a) What is his average velocity for the first 4.0 s, in meters per second? Grade Summary Potential 10000 7 8 9 4 5 6 sinO cos an0 Submissioms Attempts remaining: (3So per amempt) detailed vien cotans acoso - atano acotan sinhO cosh tanh cotanh0 Degrees o Radians Hint Hint te deductson per hint Hints remaining Feedback: le deduction per feedback " 25% Part (b) What is his instantaneous velocity, in meters per second, at t = 5.0 s? 25% Part (c) What is his average acceleration, in meters per square second, during the first 4.0 seconds of the race? 2.5 Part (d) what is his time for the race in second

Explanation / Answer

a)

at t=0 =>V=0

at t=4 s=>V=12 s

Average velocity

Vavg =(0+12)/2 =6 m/s

b)

From the graph the instantaneous velocity at t=5 s is

V=12 m/s

c)

Average acceleration

aavg =(12-0)/(4-0) =3 m/s2

d)

From the graph ,time of race is

t=10 s

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