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PRACTICE / Constant acceleration

Infer the braking acceleration

A trolley moving at 16 m/s comes to rest uniformly in 4 s.

Find its acceleration, with initial motion positive.

Organize the givens & assumptions
  • u = 16 m/s
  • v = 0
  • t = 4 s

Uniform straight-line braking until the first stop; initial motion defines the positive direction.

  1. A0 m s−20\ \mathrm{m\,s^{-2}}
  2. B−4 m s−2-4\ \mathrm{m\,s^{-2}}
  3. C4 m s−24\ \mathrm{m\,s^{-2}}
  4. D−64 m s−2-64\ \mathrm{m\,s^{-2}}

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