Version A to+200m/s to with (01·733p iiwi fions an initial velocity (0 i . 200 a

Question

Version A to+200m/s to with (01·733p iiwi fions an initial velocity (0 i . 200 a final velocity (04-240 ) m. How far does it go, in m? (440 200 b. (01+600 j) e o 1200 j) d (os 240o e (20o+240 5. A car drives by carrying a flag. It takes the flag O.025 s to go by. If the average spe the car is 20m/s, what is the length of the flag, in m? a. 40 b. 4 c. 0.25 d. 0.5 e. 0.01 6. A car starts from rest and slides down a hill at constant acceleration on ice with no friction. The car's speed increases by 5 m/s between the half way point and the bottom of the hill in a time of 2 s. What is the derivative of its speed with respect to time (dv/dt, the acceleration) at the bottom of the hill? a, ¼ l/s b. 10m c. 10 m/s d. 2.5 m/s2 e. 5 m/s

Explanation / Answer

4. a = 0i + 7.33j

v0 = 0i + 200j

vf = 0i + 240j

vf^2 - v0^2 = 2 a d

d = 0i + 1200 j

Ans(C)

5. d = v t =0.025 x 20 = 0.5 Ans(d)

6. vf = v0 + a t

a = 5/2 = 2.5 m/s^2

dv/dt = a = 2.5 m/s^2

Ans(D)

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