15. An object is moving along a straight line. The graph shows the velocity of

Physics
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15. An object is moving along a straight line. The graph shows the velocity of the object over time https://tcan4424-oakcliff-ccl.gradpoint.com/Resour...What is the instantaneous acceleration of the object at time = 6 seconds?

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16. An airplane needs to reach a velocity of 199.0km/h to take off. On a 2000-m runway, what is the minimum acceleration necessary for the plane to take flight? Assume the plane begins at rest at one end of the runway.
May 18th, 2015

V= 0.5*(t-4)^2

a = dv/dt = t-4

at t =6 

a  =6-4 = 2 m/s^2

16. 2ax = v^2-v0^2 = v^2 = (199 km/h)^2

a = 1/2 * 199^2 (km^2/h)^2/(2km)

=9900.25 km/h^2

=9000.25 *1000/3600^2 = 0.7639 m/s^2

May 18th, 2015

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May 18th, 2015
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