A projectile is shot from the ground at a velocity of #86 m/s# and at an angle of #(2pi)/3#. How long will it take for the projectile to land?

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Answer 1 · 2017-05-19T05:46:51

#15.2Sec#

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We know for non inertial frame of reference we have Newtons Laws of motion Valid We can Use the same here

On the Object we have #g# acting downwards and U (velocity) has components which we have shown .

From Newtons laws of motion we get
#V=U+at#

if we apply the same here we get
#-Usintheta=Usintheta-g"t"#

similarly we substitute the values to get

#t=(2*Usintheta)/g#
#t=(2*86sin((2pi)/3))/9.8=15.2Sec#