Question

A rock is thrown at an upward angle of 40° to the horizontal with a speed of 20 m/s. (a) What is its initial horizontal velocity? (b) What is its horizontal velocity 1.0 s after launch?
=(cos(40))(20)
=(0.76)(20)
=15.32m/s
Horizontal velocity doesn't change, so the answer a and b would be the same.

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