Question

A paricle is projected from ground with speed of
with the horizontal at time
particle is projected from ground with speed 20 m/s at an angle 60" with the horizontal at t=0.
The time t when angle between the velocity
vector of the particle and acceleration due to gravity
becomes 135º is (g = 10 m/s2)
1 = 0.​

Answer 1

Answer:

2 sec

Explanation:

t =root 2u sina/g =root2.20.sin90 /10=root4=2sec