University Physics 1 Assignment #2 Exercise 2.7 Exercise 2.7 A car is stopped at

Question

University Physics 1 Assignment #2 Exercise 2.7 Exercise 2.7 A car is stopped at a traffic light. It then travels along a straight road so that its distance from the light is given by b 2.60 m/s2 and c- 0.120 m/s session mastering physics.com Part A Calculate the average velocity of the car for the time interval t 0 to t 10.0 s. vav 14.0 m/s Submit My Answers Give Up Correct Part B Calculate the instantaneous velocity of the car at t 0 AE Submit My Answers Give Up Part C Calculate the instantaneous velocity of the car at t 5.00 s. m/s Submit My Answers Give Up Part D Calculate the instantaneous velocity of the car at t 10.0 s

Explanation / Answer

b) instantaneous velocity, v = dx/dt

= 2*b*t - 3*c*t^2

at t = 0

v = 2*2.6*0 - 3*0.12*0^2

= 0 <<<<<<---------------Answer

c) at t = 5

v = 2*2.6*5 - 3*0.12*5^2

= 17 m/s <<<<<<---------------Answer

d) at t = 10

v = 2*2.6*10 - 3*0.12*10^2

= 16 m/s <<<<<<---------------Answer

e) let at time t, v = 0

so,

v = 2*2.6*t - 3*0.12*t^2

0 = 2*2.6*t - 3*0.12*t^2

t = 14.4 s <<<<<<---------------Answer

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