Aman throws a pebble upward from a point on a cliff 85 m above the sea. the pebble drops into the water 6.2 s after it is thrown. assuming that air resistance is negligible, what is the velocity of the pebble just after it is thrown?
a) 11 m/s
b) 14 m/s
c) 17 m/s
d) 20 m/s
pleease with this i honestly dont understand it..

C) 17 m/s

Explanation:

Given:

y₀ = 85 m

y = 0 m

t = 6.2 s

a = -9.8 m/s²

Find: v₀

y = y₀ + v₀ t + ½ at²

(0 m) = (85 m) + v₀ (6.2 s) + ½ (-9.8 m/s²) (6.2 s)²

v₀ = 16.7 m/s

Rounded to two significant figures, the initial velocity is 17 m/s.

the cellphone, they would then know if the killer would have contacted them or always hated them. or if it was a breakup. but if that is not the case, then it would be the clothing. to put in a bullet, it would have to be put in by hands. hands have finger prints which, would have giving you the answer of who done it.

explanation:

found in the nucleus

has mass of one amu