In a 100m race, a sprinter accelerates for the first 40.0m at 2.56m/s^2. After this distance he reaches the top speed and maintains this speed for the rest of the race. How long did it take the sprinter to run the first 40m of the race?

total distance (dtot) = 100m

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first 40 meters (d1) = 40m

a = 2.56 m/s^2

Let's calculate this part first. We need the time.

s = 1/2 * a * t^2

t = = = = 5,5 s (circa)

a) electrical > light, sound, and thermal< < < <

) the mechanical energy of the firefighter moving.< < < < a) electrical > light, sound, and thermal< < < <

c) both a and b.

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete