2. at highest point, its speed will be zero.
vi = 25 m/s , vf =0 and a = - 9.8m/s^2
using vf^2 - vi^2 = 2 a d
0^2 - 25^2 = 2(-9.8)(H)
H = 31.9 m ..........Ans
v^2 - 25^2 = 2(-9.8)(20)
v = 15.3 m/s ........Ans
While going up,
vf = vi + a t
15.3 = 25 - 9.8 t
t = 1 sec .......Ans
while going down, vf =- 15.3 m/s
- 15.3 = 25 - 9.8 t
t = 4.11 sec ......Ans
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