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22-09-2020
Physics

contestada

A rock was dropped off a cliff from rest. It accelerated downward at 9.8m/s2
and it hits the ground 4.6 seconds later. Neglecting air resistance. what is the
rocks velocity when it hits the ground?

Respuesta :

27-09-2020

Answer:

45.1 m/s

Explanation:

use the equation v = u + at

substitute the values v = 0 + 9.8×4.6

v = 45.08

round to 3 s.f v = 45.1 m/s

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