# Speed to Overtake

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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)
• (V1) This is the velocity of the chase vehicle.
• (d) This is the distance over which the chase vehicle must  catch the lead vehicle.

Speed to Overtake (V1) The calculator returns the speed in miles per hour.  However, this can be automatically converted to compatible units via the pull-down menu.

#### The Math / Science

V1  = (d•V2) / (d - h)

where:

• V1 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.
• V2 is the velocity of vehicle two.