Question

A tennis ball is projected with a velocity of 3ms-1 at an angle of 30°to the horizontal calculate the time of flight in seconds take g=9.8ms-1

Answer 1

T=2usinA/g
=2*3*sin30/9.8
=6/(9.8*2)

=3/9.8
solve it.:-)

Answer 2

time of flight of projectile motion = 2u sin(theta) /g
so, T= 0.3sec.