Explanation:
x-component of velocity = ucos(alpha) =6.8 m/s
y - component of velocity = usin(alpha) = 21 m/s
We know that,
[tex]range = u \cos( \alpha ) \times t[/tex]
[tex]time \: of \: flight \:(t) = \frac{2u \sin( \alpha ) }{g} [/tex]
[tex]range = \frac{6.8 \times 2 \times 21}{9.8} = 29.14 \: m[/tex]