•wind
•snow
•high tide/low tide
•thunder/lightning storms
Explanation:
It is given that,
The angle of projection is 60 degrees
Initial velocity of the ball is 120 m/s
We need to find the time taken to get to the maximum height and the time of flight.
Time taken to reach the maximum height is given by :

g is acceleration due to gravity

(ii) Time of flight,

So,

Hence, this is the required solution.
Explanation:
Given:
u = 20 m/s
a = 5 m/s^2
v = 30 m/s
t = ?
Use the first kinematic equation of motion:
v = u + at
t = (v - u)/a = 10/5 = 2 seconds
When you touch<span> a doorknob (or something else made of metal), which has a positive charge with few electrons.</span>