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?

Answer 1

=(cos(40))(20)
=(0.76)(20)
=15.32m/s

Answer 2

Horizontal velocity doesn't change, so the answer a and b would be the same.