<p> <div id=\"imagePI\" class=\"problemIntroduction\">A projectile is fired from

Question

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<div id="imagePI" class="problemIntroduction">A projectile is fired from ground level at time&#160;<img src="http://session.masteringphysics.com/render?tex=t+%3D+0" alt="t = 0" align="middle" />, at an angle&#160;<img title="theta" src="http://session.masteringphysics.com/render?var=theta" alt="theta" align="middle" />&#160;with respect to the horizontal. It has an initial speed&#160;<img title="v_0" src="http://session.masteringphysics.com/render?var=v_0" alt="v_0" align="middle" />. In this problem we are assuming that the ground is level.</div>
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<div class="partText">Find&#160;<img title="t_R" src="http://session.masteringphysics.com/render?var=t_R" alt="t_R" align="middle" />, the time at which the projectile hits the ground.</div>
<div class="partInstructions">Express the time in terms of&#160;<img title="v_0" src="http://session.masteringphysics.com/render?var=v_0" alt="v_0" align="middle" />,&#160;<img title="theta" src="http://session.masteringphysics.com/render?var=theta" alt="theta" align="middle" />, and&#160;<img title="g" src="http://session.masteringphysics.com/render?var=g" alt="g" align="middle" />.</div>
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Explanation / Answer

A projectile is fired from ground level at time"t = 0" at an angle"theta"with respect to the horizontal. It has an initial speed"v_0"
In this problem we are assuming that the ground is level

the time at which the projectile hits the ground.
Express the time in terms of"v_0

Time of flight ,

T = 2 usin/g

T = 2 V_0 sin/g

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