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5. a car speeds up from rest to +16 m/s in 4 s. calculate the acceleration.
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The position of a crate sliding down a ramp is given by x=(0.05t^3) m, y=(1.7t^2) m, z=(6−0.85t^5/2) m, where t is in seconds. (a) determine the magnitude of the crate's velocity when t = 2 s. (b) determine the magnitude of the crate's acceleration when t = 2 s.

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

Which planet do you think would be easiest for humans to colonize some day?