Answer:

Step-by-step explanation:
The range of a projectile is given by :

Put R = 20 m, u = 15 m/s and finding the value of angle of projection
So,

So, the required angle of projection is equal to
.
Step-by-step explanation:
2(22/7)12²+2(22/7)(12)(18)
=2021.9
1/3 x 3 is one mile which is then 3/12 hours or 1/4 hours. Now multiply by 4 and you have

Answer:
2400 foot pounds
Step-by-step explanation: