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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)

Respuesta :

MathPhys

Answer:

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

Answer:

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.

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