2) Figure 2 represents the velocity-time graph of a moving object. a. Determine

Question

2) Figure 2 represents the velocity-time graph of a moving object. a. Determine the average acceleration of the object between Points A and B. b. Determine the instantaneous acceleration of the object at Point C v(m/s) 60 50 40 30 20 10 Figure 2 0 10 20 30 40 50 60t(s) 3) The velocity-time graph in the figure above represents the motion of a certain car a) b) Find the car's acceleration at t = 10, 25, and 35 s. Find the car's displacement from t = 0 to t = 30s. 40 O m/s Figure 3 20 10 20 30 40 50 60 Time, s

Explanation / Answer

2) (A) average acc = change in velocity / time

= (10 - 58) / (58 - 15)

= - 1.12 m/s^2

(B) aC = (40 - 60) / (50 - 25)

= - 0.8 m/s^2

3) (A) a = slope of vs vs t

at t = 10s, a = 0

at t= 25 s, a = (40 - 20)/10 = 2 m/s^2

at t = 35 s, a = (10 - 40)/10 = - 3 m/s^2

(b) displacement = area under the v vs t curve

d = (20 x 30) + (20 x 10 / 2)

d = 700 m

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