Are these two sentences's meanings the same?

Physics

1 answer:

ASHA 777 [7]3 years ago

8 0

Answer:

he pressure at the bottom of a jug filled with water does NOT depend on 5) One liter of water has a mass of ... Reasoning: To float, the density of the object must be less than the density of the 17) The reason a life jacket helps you float is, When the two life preservers are fully submerged, the buoyant force is greater.

Explanation:

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A penny is dropped from the top of a tower. It hits the ground below after 2.5 s. How tall was the tower?

pychu [463]

Answer:

C. 30.6m

Explanation:

To find the height of the tower, we are to use Newtons law of motion to solve this problem. Since the penny is falling from the top of the tower, it is acted by the acceleration due to gravity. The formula to be used is:

$H=ut+\frac{1}{2}gt^2$

Where H is the height of the tower, t is the time taken to hit the ground, u is the initial velocity and g is the acceleration due to gravity.

Given that, t = 2.5 s, g =9.8 m/s², u = 0 m/s (at the top of tower)

$H=ut+\frac{1}{2}gt^2\\\\H=0(2.5)+ \frac{1}{2}(9.8)(2.5)^2\\\\H=30.6\ m$

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