Problem 1

A ball is launched horizontally from height

h=20\,\mathrm m

u=15\,\mathrm{m/s}

above level ground. Neglect air resistance and take

g=10\,\mathrm{m/s^2}

. Horizontal motion is uniform and vertical acceleration is downward. (a) Find the first requested quantity. (b) Find the second quantity. (c) Determine the final result and check its (a) Find the flight time. (b) Find the horizontal range. (c) Find the impact speed and its angle below horizontal.

problems.proof.stepOf

problems.proof.prevStep problems.proof.nextStep

t=\sqrt{2h/g}=2\,\mathrm s

problems.proof.analysis

First identify the physical model and convention that match the stated setup. This fixes the signs used in the equations that follow.