Answer:
a) The magnitude of the speed of the ball at 2s is 19.62 m/s.
b) The ball has traveled 19.62 m after 2 seconds
c) The ball reaches the ground in 4.24 s.
Explanation:
a) The speed of the ball at 2 s after it was dropped is:
Where:
: is the final speed =?
: is the initial speed = 0 (it is dropped)
g: is the gravity = 9.81 m/s²
t: is the time = 2 s
Then, the speed of the ball at 2s is -19.62 m/s. The minus sign is because the speed is in the negative direction (down).
b) The height at which is the ball after 2 seconds is:
Taking y₀ = 0 we have:
The ball has traveled 19.62 m after 2 seconds. The minus sign is because the height is in the negative direction.
c) The time at which the ball reaches the ground is:
Therefore, the ball reaches the ground in 4.24 s.
I hope it helps you!
Answer:
probably around x100 heavier
Explanation:
Answer:
Direction of the electric force acting on the proton after it enters the electric field is along the positive y-axis.
Explanation:
In an electrical field electrical field lines goes from positive to negative. Therefore, electrical force vector is on exactly the same way with electrical field lines for a proton. Which means if the electrical field directed along the positive y-axis, electrical force for proton will be on the same way.
Explanation:
Geocentric model said that the Earth is at the center of the universe and everything revolves around it. It was considered to be stationary. Galileo proved this model incorrect with the help of his astronomical observations. Some of the key observation that he used to support the heliocentric model were:
1. He proposed the theory that the tides on the Earth occur because of its motion.
2. He observed the phases of the Venus which meant that the Venus revolved around the Sun and not the Earth.
3. He observed other planets and thus noted that they also move around the Sun and not Earth.
4. He discovered the Moons of other planets.