Question

Comprehension for question 7 to 9:
[g= 10 m/s? 1
The trajectory of a projectile in a vertical plane is y = √3 x-2x^2.
Angle of projection is :
(1) 30
(2) 60°
(3) 45°
(4) √3 rad
Maximum height is H
(1) 8/3
(2) 3/8
(3)√3
(4) 2/√3
Range OA is :
(1) √3/2
(2) √3/4
(3) √3
(4) 3/8
10.
A projectile is fired with a velocity at right angle to the slope which is inclined at an angle theeta with horizontal. The expression for the range R along the incline is:
(1) 2v^2sec theeta/g
(2)2v^2tan theeta/g
(3)2v^2tan theeta Sec theeta /g
(4)v^2tan^2theeta/g​

Answer 1

for 3rd just use the formula