Using the idea of motion under gravity, it will take 0.5 seconds more before the phone hits the ground.
<h3>What is the distance covered?</h3>
The distance covered is obtained form the equations of kinematics under gravity.
Now;
v = u + gt
Recall that it was dropped from a height hence u = 0 m/s
v = gt
v = 9.8 m/s^2 * 4 s
v = 39.2 m/s
Now;
h = ut + 1/2gt^2
but u = 0 m/s
h = 1/2gt^2
h = 1/2 * 9.8 * (4)^2
h = 78.4 m
The phone will not hit the ground within this time
For the phone to hit the ground;
h = 1/2gt^2
if h = 100 m
100 = 1/2 * 9.8 * t^2
2 * 100/9.8 = t^2
t = √2 * 100/9.8
t = 4.5 seconds
It will take about 0.5 seconds more before the phone will hit the ground.
Learn more about motion under gravity:brainly.com/question/15120445
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Answer: The atomic number is the number of protons in an atom, and isotopes have the same atomic number but differ in the number of neutrons. The number of protons in an atom is called its atomic number. This number is very important because it is unique for atoms of a given element. All atoms of an element have the same number of protons, and every element has a different number of protons in its atoms.
Explanation:
Answer:If the kinetic and potential energy in a system are equal, then the potential energy increases. ... Stored energy decreases. Energy of motion decreases. Total energy decreases
Explanation:
Answer:
I=2.80 A
Explanation:
We Know that R =R₀(1+∝ ΔT)
R=R₀ (1+3.9*10⁻³ *(61-20))
R=R₀ (1.1599)
I=V/R=V/(R₀ (1.1599)
1.4 = V/(R₀ (1.1599) ∵ equation 1
We have to calculate I when T=-88°
R =R₀(1+∝ ΔT)
R=R₀ (1+3.9*10⁻³ *(-88-20))
R=R₀ (0.5788)
I=V/(R₀ (0.5788) ∵equation 2
Dividing equation 2 by equation 1
I = 2.80 A
