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Sagot :

Answer:

u = 5 m/s

Step-by-step explanation:

Given

  1. s = 20 m
  2. t = 2 s
  3. a = 5 m/s²

Required Formula

  • s = ut + 1/2at²

Solving

  • 20 = 2u + 1/2(5)(2)²
  • 20 = 2u + 10
  • 2u = 10
  • u = 5 m/s
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