Question

calculate the displacement travelled by an object if moving with an initial speed of 20 metre second -1 ,stop by a retardation of 5 metre second -2​

Answer 1

Answer:

-40 metres

Step-by-step explanation:

u = 20 m/s

v = 0 m/s (since the vehicle stops)

a = -5 m/s⁻²  

using Newton's third equation of motion,

v² = u² + 2as

⇒s = (v² - u²) / 2a

⇒s = (0 - 20²) / 2 × -5

⇒s = 400 / -10 = -40

∴ displacement = -40 metres

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