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ProAtWork7
27.01.2020 •
Physics
In a race, usain bolt accelerates at 1.99m/s^2 for the first 60.0m, then decelerates at -0.266m/s^2 for the final 40.0m. what was his final velocity? (unit = m/s)
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Ответ:
14.7 m/s
Explanation:
During the first phase, given:
Δx = 60.0 m
v₀ = 0 m/s
a = 1.99 ms²
Find: v
v² = v₀² + 2aΔx
v² = (0 m/s)² + 2 (1.99 m/s²) (60.0 m)
v = 15.5 m/s
During the second phase, given:
Δx = 40.0 m
v₀ = 15.5 m/s
a = -0.266 ms²
Find: v
v² = v₀² + 2aΔx
v² = (15.5 m/s)² + 2 (-0.266 m/s²) (40.0 m)
v = 14.7 m/s
Ответ:
the answer is B. AVERAGE ACCELERATION
Explanation: