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Representing Motion

AP Physics 1· difficulty 2/5

An object's position obeys x(t)=5−3t+t2x(t) = 5 - 3t + t^2 (SI units). What is its velocity at t=0t = 0?

  • A

    −3 m/s-3~\text{m/s}

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  • B

    00

  • C

    +5 m/s+5~\text{m/s}

  • D

    +3 m/s+3~\text{m/s}

Explanation

Compare to x0+v0t+12at2x_0 + v_0 t + \tfrac{1}{2} a t^2. Here v0=−3 m/sv_0 = -3~\text{m/s} and a=2 m/s2a = 2~\text{m/s}^2.

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