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Science>physics A car tavels at 20 km/h for 1 hour, at 30km/h for 2 hours, and at 40 km/h for another 2 hours. calculate the average speed of car.

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Hi,

The average speed of car would be : 32 kmph

Good Luck.

Live, Love Laugh.

Posted on Sep 11, 2008

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If a car went from 0 to 100 km/h in 3.7 seconds, using the accelerationn formula how would I find the average acceleration?


Convert the speed from km / h to m/s.
Change in speed = (Final speed (in m/s) - initial speed (0))/ 3.7 s
The result is the average acceleration in m / s^2.
100 km /h = (100 000 m)/ (3600 s)= 27.7778 m/s

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What's the average ball speed?


The average ball speed for a bowling is about 10 miles per hour to15 miles per hour with professional bowlers averaging about 20 to 25 miles perhour, the power of the throw depends on the bowling game type you're playingand your physical strength. You can improve your throwing speed by practicingyour throws and strengthening you forearm.

Jul 23, 2012 | Sport & Outdoor - Others

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Meter to kilometer


There are 1000 meters in a kilometer and 3600 seconds in an hour (60 seconds per minute, 60 minutes per hour).

Press 8 0 0 / 5 0 * 3 6 0 0 / 1 0 0 0 =
or 8 0 0 / 1 0 0 0 * 3 6 0 0 / 5 0 =

The result should be 57.6 kph.

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On a round trip of 400km,a pilot wants to determine the airspeed of hiis light plane. He flies the entire distance at the same airspeed for the first 200km a steady headwind slows him down by 30km/hour....


v will represent plane's airspeed.


We can divide pilot's trip in 2 parts:
  1. first 200km, when he is flying with speed v. The time it takes him to fly this part of trip is t=200/v
  2. last 200km, when he is flying with speed v-30. The time it takes him to fly this part is 200/(v-30)
The time it takes him for second part of trip is also equal to 1.5-t (because entire trip takes 1.5h), so now we can write equation:

1.5-t=200/(v-30)

We also know that t=200/v so we substitute that into equation:

1.5-200/v=200/(v-30)

To solve this equation we multiply it with v*(v-30)=v^2-30v first. We get:

1.5(v^2-30v)-200(v-30)=200v

Now we get rid of brackets:

1.5v^2-45v-200v+600-200v=0

or

1.5v^2-445v+600=0

This is quadratic equation, so we get 2 solutions (sqrt= square root):

  1. v=(445+sqrt(445^2-4*1.5*600))/(2*1.5)=295.3 km/h
  2. v=(445-sqrt(445^2-4*1.5*600))/(2*1.5)=1.4 km/h
We know that only v=295 km/h is solution because if 1.4 km/h was solution that would mean that second part of trip plane was flying with speed 1.4-30= -28.6 km/h, so that would mean he was flying backwards (which we know he didn't because it's round trip). Speed 1.4 km/h is also not physical solution, because plane wouldn't be able to take off with such small speed :)

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1 Answer

A bicycle travels 12 km in 40 min. What is its average speed in km/hr?


18 km/hour

The bike is traveling at the speed of 12/40 = 6/20 =18/60

18 km/60 minutes

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What are the numbers on face plate for(likes 60,65,....900,1000)?


The ones associated with the little circles? One dial is for seconds, one for minutes, and one for hours. The seconds one should be applicable for time. The minute and hour, along with the big seconds hand that is centre mounted are for the chronograph function.

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