rashel50
contestada

-You accelerate from -17m/s to 31m/s with an acceleration of 8m/s^2.
What was your displacement during this time? Explain please

-A car accelerates from rest at 4 m/s^2.
What is the velocity of the car after 4 seconds? Explain please

Respuesta :

MathPhys

Answer:

42 m

16 m/s

Explanation:

Given:

v₀ = -17 m/s

v = 31 m/s

a = 8 m/s²

Find: Δx

v² = v₀² + 2aΔx

(31 m/s)² = (-17 m/s)² + 2 (8 m/s²) Δx

Δx = 42 m

Given:

v₀ = 0 m/s

a = 4 m/s²

t = 4 s

Find: v

v = at + v₀

v = (4 m/s²) (4 s) + 0 m/s

v = 16 m/s

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