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6. Which equation is incorrect

  • v^2=u^2+2as
  • v=u+at
  • s=ut+at^2
  • s=((u+v)/2)t

7. A ball is thrown downward from the top of a roof with a speed of 25 m/s. After 2 s, its velocity will be

  • 20m/s
  • -44.6 m/s
  • -5.4 m/s
  • 44.6 m/s