Problem #9: A pebble falls from a bridge into the river below. If the pebble falls for 1.20 s, what is its
velocity when it hits the water?

-11.0 m/s

-8.17 m/s

-11.8 m/s

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.

What is the measure of a change in an objects velocity?

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