a bird flying horizontally accidently at 4.25m/s accidentally drops a rock it was carrying. A short time later, the rocks velocity is 13.0m/s at - 70.9. How much time has passed? (unit s)

Question

Physics

Dixie Steele

2 February, 10:38

a bird flying horizontally accidently at 4.25m/s accidentally drops a rock it was carrying. A short time later, the rocks velocity is 13.0m/s at - 70.9. How much time has passed? (unit s)

+4

Answers (2)

Know the Answer?

Zoey Hurst · Answer 1

3.8 seconds

Explanation:

Given equation=⇒ h=1/2gt∧2

where h=height

g=gravitational force=9.8m. sec∧2

t=time=?

we have: - 70.9*2=-9.8 * t∧2

141.8/9.8 = t∧2

14.4 = t∧2

t = 3.8 sec has passed.

Paul · Answer 2

1.25 s

Explanation:

Given:

v₀ᵧ = 0 m/s

vᵧ = 13.0 sin (-70.9) m/s

aᵧ = - 9.8 m/s²

Find: t

In the y direction:

v = at + v₀

13.0 sin (-70.9) = (-9.8) t + 0

t = 1.25