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AP EAMCET202119 Aug 2021Morning ShiftPhysicsMotion in One DimensionActual

Which of the following decreases, in motion on a straight line, with constant retardation?

Options

  1. ASpeed
  2. BAcceleration
  3. CDisplacement
  4. DDistance

Correct answer

A. Speed

Step-by-step solution

Using the equation of uniform motion v = u + a t Here, v   is final speed, u   is initial speed and a   is the acceleration for time t . Now, there is constant retardation in motion,i.e., acceleration = - a Therefore, v = u + - a t v = u - a t ∴ v < u Hence, the speed of the body will decrease under constant retardation.

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