Answer:
The speed of elevator fast and slows down shows through the diagram.
Explanation:
Given that,
Amanda has just entered an elevator. The elevator rises and stops at the third floor.
Let us consider the elevator at rest then the speed will be zero.
When elevator start from rest then the speed increases with constant acceleration and near the third floor it slow down with constant deceleration and finally becomes at rest at third floor.
We need to draw the diagram distance and time
Using given data,
First, the displacement A to B will be increases fastly and B to C the displacement increases slowly slowly.
Hence, The speed of elevator fast and slows down shows through the diagram.
Answer:
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we know that,
Frequency = 1/ time period
hence, Feq = 1/5 ===> 0.2 Hz
hence, wave velocity = freq * wavelength
hence,
V = 0.2 * 100
==> Wave velocity = 20 m/s
Answer:
223.61 km
Explanation:
Speed of car traveling south = 100 km/h
Speed of car traveling west = 50 km/h
Time each car travels = 2 hours
Distance = Speed×Time
Distance covered by car traveling south = 100×2 = 200 km
Distance covered by car traveling west = 50×2 = 100 km
Consider the distance covered by car traveling south as the base of a triangle and the distance covered by car traveling west as the height of a triangle
Distance between them after 2 hours would be the hypotenuse of the triangle
Pythagoras theorem
Hypotenuse = √(Base²+Height²)
⇒Hypotenuse = √(200²+100²)
⇒Hypotenuse = 223.61 km
So, they are 223.61 km apart two hours later.