truck increases uniformly from 15km/hr to 60km/hr in 20 sec, what is its average velocity
2006-07-31 15:57:13 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Physics
When the speed increases uniformly, the average speed is obtained by adding the initial speed and final speed and the dividing it by two.
Average speed is (v + u) / 2.
Therefore, in the given problem it is 37.5 km/ hour.
If the speed is not increasing uniformly, then the average speed is got only by finding the total distance and dividing it by the total time.
2006-07-31 19:36:36 · answer #1 · answered by Pearlsawme 7 · 0⤊ 0⤋
The time is irrelevent in this situation. Simply average the speeds. 37.5 is correct.
2006-07-31 23:50:38 · answer #2 · answered by Jdude 2 · 0⤊ 0⤋
Sharanan is correct; 37.5 km/h.
The time it takes to accelerate from 15 to 60 km/h is not relevant, the uniform acceleration is.
2006-07-31 23:27:50 · answer #3 · answered by minefinder 7 · 0⤊ 0⤋
37.5 km/hr
2006-07-31 23:45:24 · answer #4 · answered by John (Thurb) McVey 4 · 0⤊ 0⤋
It will be 37.5.
2006-07-31 23:04:55 · answer #5 · answered by sharanan 2 · 0⤊ 0⤋