The speed is 16.2 m/s
Explanation:
Assuming the runner is moving by uniform motion (=at constant velocity), then we can find his speed by using the equation:
where
v is the speed
d is the distance covered
t is the time elapsed
For the runner in this problem, we have:
The initial position is 10 m while the final position is 80 metres, so the distance covered is
d = 80 - 10 = 70 m
While the time elapsed to cover these 70 m is
t = 4.32 s
Therefore, substituting into the equation, we find the speed:
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Answer:
Use your curtains. ...
Use timers on your central heating. ...
Move your sofa. ...
Maximise your insulation. ...
Wrap up warm. ...
Turn down the dial. ...
Block out the draughts. ...
Install thermostatic radiator valves.
Answer: a.troposphere
Explanation: Most of the mass (about 75-80%) of the atmosphere is in the troposphere. Almost all weather occurs within this layer. Air is warmest at the bottom of the troposphere near ground level. Higher up it gets colder. Air pressure and the density of the air are also less at high altitudes.
A, both potential and kinetic energy as mechanical energy is the sum of potential and kinetic energy.