A girl throws a rock straight down from a bridge at 15 m/s. How fast is the rock moving 3.0 s later? [44 m/s down]

v = 44m/s

Explanation:

Using the equation of motion

v = u + at

Because it's under gravity

v = u + gt , where

v = final velocity

u = initial velocity

g = acceleration due to gravity

t = time taken

From the question

v=?

u = 15m/s

g = 9.81m/s²

t = 3s

Therefore v = u + gt

v = 15 + 9.81(3)

v = 15 + 29.43

v = 44.43m/s

Approximating to nearest whole number

v = 44m/s

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the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.