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# Speed to Overtake

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Equation / Last modified by KurtHeckman on 2019/05/02 11:07
`V_1 = `

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vCalc.Speed to Overtake

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The **Speed to Overtake** calculator computes the average speed required to overtake a vehicle based on the speed of the vehicle, the head start, and the total distance.

**INSTRUCTION:** Choose units and enter the following:

- (
**h**) Distance between the vehicle (i.e. the head start) - (
**V**) This is the velocity of the chase vehicle._{1} - (
**d**) This is the distance over which the chase vehicle must catch the lead vehicle.

**Speed to Overtake (V _{1}**) The calculator returns the speed in miles per hour. However, this can be automatically converted to compatible units via the pull-down menu.

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#### The Math / Science

The formula for the speed required to overtake is:

V_{1} = (d•V_{2}) / (d - h)

where:

- V
_{1}is the velocity or speed to overtake - d is the distance required at the specified velocities for vehicle 1 to overtake vehicle 2.
- h is the distance between the vehicles or the head-start.
- V
_{2}is the velocity of vehicle two.

This equation,

**Speed to Overtake**, is used in 1 calculator.**Calculators**