A ball is thrown vertically upward with speed 20m/s from height of 25 m building find the time taken to for the ball to reach the ground
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S = ut - 1/2gt^2
Upward + sign and - for downward
Put s =-25 , g =10, u 20
- 25 =20*t - 1/2*10*t^2
5t^2 - 20t - 25=0
t^2 - 4t - 5=0
t^2 - 5t+t - 5=0
(t - 5)(t+1)=0
Take + value
t =5 s
Upward + sign and - for downward
Put s =-25 , g =10, u 20
- 25 =20*t - 1/2*10*t^2
5t^2 - 20t - 25=0
t^2 - 4t - 5=0
t^2 - 5t+t - 5=0
(t - 5)(t+1)=0
Take + value
t =5 s
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