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April 20, 2014

Homework Help: physics college

Posted by meera on Friday, October 8, 2010 at 10:49am.

An antelope moving with constant acceleration covers the distance between two points 70.0
m apart in 7.00 s. Its speed as it passes the second point is 15.0 m/s. (a) What is its speed at the first
point? (b) What is its acceleration?







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 x(t) = bt2 ct3, where b = 2.40m/s2 and c = 0.120m/s3. (a) Calculate the average
velocity of the car for the time interval t = 0 to t = 10.0 s. (b) Calculate the instantaneous velocity of the
car at t = 0, t = 5.0 s, and t = 10.0 s. (c) How long after starting from rest is the car again at rest?

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