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A car travels with an average speed of 22 m/s.what is this speed in km/s
2 answers:
Answer:
22 m/s = 79.2 km/h
Explanation:
Given that,
The average speed of the car is 22 m/s. Here, we need to convert the speed to km/h. Firstly, we will see the following conversions as :
1 kilometres = 1000 meters
1 hour = 3600 seconds
To convert m/s to km/h we must use these coversions.
After solving the above expression, we get
22 m/s = 79.2 km/h
So, the car travel with a speed of 79.2 km/h. Hence, this is the required solution.
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Answer:
It must be 4 times high.
Explanation:
- Assuming that the car can be treated as a point mass, and that the ramp is frictionless, the total mechanical energy must be conserved.
- This means, that at any time, the following must be true:
- ΔK (change in kinetic energy) = ΔU (change in gravitational potential energy)
⇒
- Let's call v₁, to the final speed of the car, and h₁ to the height of the ramp.
So, at the bottom of the ramp, all the gravitational potential energy
must be equal to the kinetic energy of the car (Defining the bottom of
the ramp as our zero reference for the gravitational potential energy):
(1)
- Now, let's do v₂ = 2* v₁
- Replacing in (1) we get:
(2)
- Dividing (2) by (1), and rearranging terms, we get:
- h₂ = 4* h₁