Engineering Board Exam Reviewer · Rectilinear Motion: Velocity and Acceleration · medium

A ball is thrown upward so that its height is s=40t-5t2 meters. Find the maximum height.

  1. 80 m
  2. 160 m
  3. 40 m
  4. 100 m

Answer

A. 80 m

Solution

v=40-10t=0 t=4 s. Then s(4)=160-80=80 m.

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  2. A particle's position is s=2t3-3t2+t meters. Find its acceleration at t=1 s.
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