A. Compute the average acceleration during the time interval t =0 to t =10sCompu

Question

A. Compute the average acceleration during the time interval t=0 to t=10sCompute the average acceleration during the time interval t=0 to t=10s

B. Compute the average acceleration during the time interval t=30s to t=40s

C. Compute the average acceleration during the time interval t=10s to t=30s .    

D.Compute the average acceleration during the time interval t=0 to t=40s .

E. What is the instantaneous acceleration at t=20s

F. What is the instantaneous acceleration at t=35s

The figure (Figure 1) shows the velocity of a solar- powered car as a function of time. The driver accelerates from a stop sign, cruises for 20 s at a constant speed of 60 km/h, and then brakes to come to a stop 40 s after leaving the stop sign. Figure 1 V of 1 vr (km/h) 60 H 50 40 30 H 20 10 F t (s) 5 10 15 20 25 30 35 40

Explanation / Answer

dv = 60 km/h

=(60km/h)*(1000m/1km)*(1h/3600s)

dv = 16.667 m/s²

a) a = dv/dt

= 16.667/10 = +1.667 m/s²

b) a = dv/dt = -16.667/10 = -1.667 m/s²

c) a = dv/dt = 0/20 = 0 m/s²

d) a = dv/dt = 0/40 = 0 m/s²

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