Question

hey guys here is ur que. - a ball is thrown vertically downward with a velocity" u" from a building of height "h". find the time taken by the ball to rich the ground. plz explain in understoodable manner ​

Answer 1

Answer:

If it is a free fall then ,

time taken

= v= gt

= t = v/ g

HOPE it HELPS you

Answer 2

Answer:

Explanation:

Assumption before answering

1. Object is a point mass.
2. There is no variation of acceleration due to gravity (g is assumed to be constant=10m/s^2)
3. There is no air resistance.
4. Height of the thrower is neglected.

Now we can start answering .As the acceleration is constant(both in magnitude as well as direction) we can use equations of motion for uniform acceleration.

Defining our coordinate axis

As our motion is one dimensional choosing only one axis . Let upward direction is assumed positive.

Using equation , v=u +a*t { u=+20m/s , a=-10m/s^2, v=0 }

putting all the values

t=2 s