Dennis throws a volleyball up in the air. It reaches its maximum height 1.1\, \text s1.1s1, point, 1, start text, s, end text later. We can ignore air resistance. What was the volleyball's velocity at the moment it was tossed into the air?

If max height = 1.1 meters, then initial velocity is 3.28 m/s

If max height is 1.1 feet, then the initial velocity is 5.93  ft/s

Explanation:

Recall the formulas for vertical motion under the acceleration of gravity;

for the vertical velocity of the object we have

for the object's vertical displacement we have

If the maximum height reached by the object is given in meters, we use the value for g in which is:

If the maximum height of the object is given in feet, we use the value for g in    which is :

Now, when the ball reaches its maximum height, the ball's velocity is zero, so that allows us to solve for the time (t) the process of reaching the max height takes:

and now we use this to express the maximum height in the second equation we typed:

Then if the max height is 1.1 meters, we use the following formula to solve for :

If the max height is 1.1 feet, we use the following formula to solve for :

0.19 m/s and 0.45 m/s

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards