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a girl on a bridge throws a rock straight down at -12.5 m/s. it hits the ground 38.4 m below. How much time did it take?
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18 votes
18 votes
a girl on a bridge throws a rock straight down at -12.5 m/s. it hits the ground 38.4 m below. How much time did it take?

User Sangam Uprety
by
2.9k points

2 Answers

6 votes
6 votes

Answer:

1.80

Step-by-step explanation:

38.4=-12.5(a)-1/2(-9.80)(a)^2

a= acceleration
^2 is the exponent

User Ametren
by
3.3k points
26 votes
26 votes

The acceleration of both the rocks is only due to the gravitational force acting on them. Even though the speed of thrown rock would be greater than that of dropped rock, the acceleration of both the rocks would be g downwards.

User Suparna
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2.6k points
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