Projectile Motion

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A projectile is launched at $20$ m/s at $30^\circ$ above horizontal. What is its initial vertical velocity component?

10

m/s

17.3

m/s

20

m/s

5

m/s

The vertical acceleration of a projectile (no air resistance) is:

A.Zero

B.g downward (≈ 9.81 m/s²)

C.Horizontal

D.Constant velocity

A ball is thrown horizontally from a 20 m high cliff. How long until it hits the ground (g = 9.81 m/s²)?

A.About 2.0 s

B.About 4.1 s

C.About 1.0 s

D.About 0.5 s

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