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An NFL prospect is running the 40-yard dash (also known as the 36.6-meter dash). He accelerates at 4.9 m/s² to a final velocity of 8.17 m/s, then finishes the rest of the dash at that velocity. What was this prospect's 40-yard dash time?

Answer :

The NFL prospect's 40-yard dash time is approximately 5.92 seconds.

How to find dash time?

1. Calculating the time for acceleration:

Using the equation of motion: v = u + at,

where v = final velocity, u = initial velocity, a = acceleration, and t = time.

Given:

Initial velocity (u) = 0 m/s (assuming the prospect starts from rest)

Final velocity (v) = 8.17 m/s

Acceleration (a) = 4.9 m/s²

v = u + at

8.17 = 0 + 4.9t

Solving for t:

t = 8.17 / 4.9

t ≈ 1.67 seconds

2. Calculating the time for the remaining distance:

The remaining distance is 36.6 m - the distance covered during acceleration.

Distance covered during acceleration:

Using the equation of motion: s = ut + (1/2)at²

s = 0 × t + (1/2) × 4.9 × t²

s = (1/2) × 4.9 × t²

Distance covered during acceleration = (1/2) × 4.9 × (1.67)²

Remaining distance = 36.6 m - [(1/2) × 4.9 × (1.67)²]

3. Calculating the time for the remaining distance:

Using the equation of motion: s = vt,

where s is the remaining distance, v is the constant velocity, and t is the time.

s = v × t

[36.6 - (1/2) × 4.9 × (1.67)²] = 8.17 × t

Solving for t:

t = [36.6 - (1/2) × 4.9 × (1.67)²] / 8.17

t ≈ 4.25 seconds

4. Calculating the total dash time:

Total dash time = time for acceleration + time for remaining distance

Total dash time = 1.67 + 4.25

Total dash time ≈ 5.92 seconds

Therefore, the NFL prospect's 40-yard dash time is approximately 5.92 seconds.

Find out more on dash time here: https://brainly.com/question/30922179

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