Question

A ball is thrown horizontally from a cliff and hits the ground 4 seconds later 40

meters from the base of the cliff. How fast was the ball thrown?

Answer 1

10 m/s

Step-by-step explanation:

Given:

Δx = 40 m

t = 4 s

aₓ = 0 m/s²

Find: v₀ₓ

x = x₀ + v₀ₓ t + ½ aₓ t²

40 m = v₀ₓ (4 s) + ½ (0 m/s²) (4 s)²

v₀ₓ = 10 m/s