smilequi9653
12.03.2020 •
Physics
A person on a road trip drives a car at different constant speeds over several legs of the trip. She drives for 10.0 min at 50.0 km/h, 19.0 min at 100.0 km/h, and 60.0 min at 55.0 km/h and spends 40.0 min eating lunch and buying gas. What is the average speed for the entire trip (
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Ответ:
It is given that for different time span car have different speed and also the person spend
in eating lunch and buying gas.
We know , average speed is total distance covered by total time taken .
Therefore , average speed ,
Hence, this is the required solution.
Learn More :
Average speed
Ответ:
A car moving 3 times as fast has 9 times as much kinetic energy.
If the force of friction between the tires and the ground
is the same at every speed, then the car has to go 9 times
as far to burn off the increased kinetic energy.
9 x 15m = 135 meters