(a) A boy throws several balls out of the window of his house at different angles to the horizontal. All balls are thrown at speedu = 10 m//s and it was found that all of them hit the ground making an angle of 45° or larger than that with the horizontal. Find the height of the window above the ground [take g = 10 m//s^(2)] (b) A gun is mounted on an elevated platform AB. The distance of the gun at A from the edge B is AB = 960 m. Height of platform is OB = 960 m. The gun can fire shells with a velocity of u = 100 m//s at any angle. What is the minimum distance (OP) from the foot of the platform where the shell of gun can reach ?

(a) A boy throws several balls out of the window of his house at diffe

1.	(a) A boy throws several balls out of the window of his house at different angles to the horizontal. All balls are thrown at speedu = 10 m//s and it was found that all of them hit the ground making an angle of 45° or larger than that with the horizontal. Find the height of the window above the ground [take g = 10 m//s^(2)] (b) A gun is mounted on an elevated platform AB. The distance of the gun at A from the edge B is AB = 960 m. Height of platform is OB = 960 m. The gun can fire shells with a velocity of u = 100 m//s at any angle. What is the minimum distance (OP) from the foot of the platform where the shell of gun can reach ?
Answer» ANSWER :(a) `5M` (B) `480 m`