The top of the trajectory is the point where it changes from rising to falling. At that exact instant, its vertical speed is zero.
Answer:
38.8 km/hr
Explanation:
The total distance is 2 × 282 km = 564 km.
The total time is 6 hr 32 min + 8 hr = 14 hr 32 min = 14.533 hr.
The average speed is:
(564 km) / (14.533 hr)
38.8 km/hr
Answer:
h = 78.4 m
Explanation:
Given that,
A stone takes 4s for the stone to touch the river's water surface.
We need to find the height of the bridge from the water level.
Let the height be h. We can use the second equation of motion to find h. So,
So, the height of the bridge from the water level is 78.4 m.
The electrostatic force between the two charges is
Explanation:
The electrostatic force between two charges is given by Coulomb's law:
where:
is the Coulomb's constant
are the two charges
r is the separation between the two charges
In this problem, we have the following data:
is the magnitude of the two charges, where
is the fundamental charge
is the separation between the two charges
Substutiting into the equation, we find the force:
Learn more about electric force:
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