Question

An object is projected at an angle of elevation of 45 degrees with a velocity of 100 m/s. Calculate its
(i) range
(ii) time of flight

Answer 1

use projectile formula
Range=u^2sin@/g
time of flight=2usin@/g
where u is the initial velocity @ is angle of elevation with velocity and g is acceleration due to gravity

now
Range=(100)^2sin (2 x 45)/10=1000m
time of flight=2 (100) sin45/10=10root2 sec