Question

The equation of trajectory of projectile is y = 2x -\(\frac{x^2}{5},\) x and y are in meter. Which of the following statements is incorrect? (g = 10ms^-2)

(1) Speed of projection = \(\frac{5\sqrt{5}}{2}ms^{-1}\)

(2) Angle of projection, θ = sin^-1 (2/5)

(3) Maximum vertical height = H = 5m.

(4) Time of flight = T = 1s

Answer 1

(4) Time of flight = T = 1s

The equation of trajectory of a projectile is

comparing given equation of trajectory with Eqn. (1) we have, tan θ = 2 .

Also,

H = The maximum vertical height 

T = The time of flight