CAIE A-Level Physics AS 2.1.7 Equations That Represent Uniformly Accelerated Motion in a Straight Line Questions

Apply the equations of uniformly accelerated motion in a straight line to calculate displacement, velocity, acceleration and time.

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Apply the equations of uniformly accelerated motion in a straight line to calculate displacement, velocity, acceleration and time.

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A delivery company suggests using a remote-controlled aircraft to drop a parcel into the garden of a customer. When the aircraft is vertically above point P on the ground, it releases the parcel with a velocity that is horizontal and of magnitude $5.4 \mathrm{~ms}^{-1}$ . The path of the parcel is shown in Fig. 2.1.

Fig. 2.1 (not to scale)

The parcel takes a time of 0.81 s after its release to reach point Q on the horizontal ground. Assume air resistance is negligible.

Determine the height h of the parcel above the ground when it is released.

$\begin{aligned} s=u t+1 / 2 a t^{2} h=1 / 2 \times 9.81 \times 0.81^{2} \end{aligned}$ $=3.2 \mathrm{~m}$

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CAIE A-Level Physics AS 2.1.7 Equations That Represent Uniformly Accelerated Motion in a Straight Line Questions question 1