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## Homework Statement

A cannon fires successively two shells with velocity u=250 m/s;the first at angle [tex]\theta1[/tex]=[tex]\pi/3[/tex] & the second shell at an angle [tex]\theta2[/tex]=[tex]\pi/4[/tex] to the horizontal, the azimuth being same. Neglecting air drag, find the time interval between firings leading to colling of shells.

## Homework Equations

range R=(u^2sin2[tex]\theta[/tex])/g

Time of flight t=(2usin[tex]\theta[/tex])/g

## The Attempt at a Solution

I'm really confused &unable to figure out.

Book says that its 11s.