Answer:
14.7 m/s.
Explanation:
From the question given above, the following data were obtained:
Time (t) = 1.5 s
Acceleration due to gravity (g) = 9.8 m/s².
Height = 11.025 m
Final velocity (v) = 0 m/s
Initial velocity (u) =?
We, can obtain the initial velocity of the penny as follow:
H = ½(v + u) t
11.025 = ½ (0 + u) × 1.5
11.025 = ½ × u × 1.5
11.025 = u × 0.75
Divide both side by 0.75
u = 11.025/0.75
u = 14.7 m/s
Therefore, the penny was travelling at 14.7 m/s before hitting the ground.
80 joules
Given:
A 2 kg mass is held 4 m above the ground.
Let us write as follows:
Question:
What is the approximate potential energy (PE) due to gravity of the mass with respect to the ground?
The Process:
We will solve the problem of gravitational potential energy.
Gravitational potential energy = mgh, where m represents mass (in kg), g represents Earth's gravitational field (10 N kg⁻¹), and h represents the height change (in m).
Let us find out the approximate potential energy due to the gravity of the mass concerning the ground on the Earth.
Gravitational potential energy = (2 kg)(10 N kg⁻¹)(4 m)
Thus, gravitational potential energy equal to 80 joules.
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Notes:
Its just that the number of neutrons range from 0 to 2. (distance from 1 to 3 is 2)
Not totally sure about this one... I had it as a question in a 25 question test, and this was my answer. I got a 96% on that test, which means I only got one wrong, so this is probably right.
Answer:
The first one.
If the road becomes wet or crowded, you should slow down and increase your following distance.
If the road becomes wet or crowded, you should slow down and increase your following distance. This is important because wet roads reduce tire traction and increase the risk of sliding and losing control. By slowing down and increasing your following distance, you give yourself more time to react and stop if necessary.
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