A cyclist is initially at rest at the origin. At t=0 she starts to accelerate at a constant rate, along a straight road reaching a velocity of 4.00 m/s after 12.0 seconds. 12.0 seconds after starting a prairie dog runs across her path and the cyclist hits the brakes, producing a new constant acceleration. 13.0 seconds after starting, the cyclist has a velocity of 1.50 m/s . What is the acceleration, a1a1, of the cyclist in the first part of the motion, between t = 0 and 12s? What is the acceleration of the cyclist, a_2 , in the second part of the motion between t = 12 and 13s? What is her average acceleration in this 13-s interval?

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Projectile Motion