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I want to build a Go-Kart/Electric Car, I don't need everything to be perfect yet but I just want to make sure the calculations I am running are okay.

I started out from scratch by assuming that all the masses of/in my cart would be multiplied by gravity.

So running a quick inventory on what my bare average weight will be:

4 x 5HP Motors = 4 x 83 lbs = 332 lb or

**151 kg**

400 lb occupant capacity =

**182 kg**

4 x 10kg wheels/tires =

**40kg**

Material making up the actual car =

**40kg**

(No braking system or steering system accounted for yet but that's fine.)

**Total = 413kg**

Total Weight = (413 kg) * (9.8 m/s

^{2}) =

**4047 N**

Now 1HP = 746W so (4)*(5HP)*(746W/HP) =

**14920W**(14.92kW).

14.92kW = 14920(J/s) and 14920(J/s) = 14920([N*m]/s)

and

14920([N*m]/s) / 4047(N) = 3.7(m/s) * 3600(s/h) = 13.32(km/h) / 1.6(km/mi) =

**8.3 mph**

Are these conversions being used correctly? Am I therefore correct in assuming that at full motor capacity if one motor is attached to each of the four wheels that the vehicle will be able to travel a maximum speed of 8.3 mph?