For a short time the position of a roller-coaster car along its path is defined by the equations r = 25 m, = (0.3t) rad, and z = (-8 cos) m, where t is measured in seconds, Determine the magnitudes of the car's velocity and acceleration when t = 4s.

For a short time the position of a roller-coaster car along its path

1.	For a short time the position of a roller-coaster car along its path is defined by the equations r = 25 m, = (0.3t) rad, and z = (-8 cos) m, where t is measured in seconds, Determine the magnitudes of the car's velocity and acceleration when t = 4s.
A.	v = 7.83 m/s, a = 2.27 m/s2
B.	v = 9.74 m/s, a = 2.51 m/s2
C.	v = 7.50 m/s, a = 2.25 m/s2
D.	v = 5.26 m/s, a = 1.989 m/s2
Answer» B. v = 9.74 m/s, a = 2.51 m/s2

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For a short time the position of a roller-coaster car along its path is defined by the equations r = 25 m, = (0.3t) rad, and z = (-8 cos) m, where t is measured in seconds, Determine the magnitudes of the car's velocity and acceleration when t = 4s.

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