If u drop a bouncy ball off a roof and it takes 1.2 seconds to hit the ground how tall is the roof

Here's the formula to use:

D = 1/2 A T²

Distance = (1/2) (Acceleration) (time)²

Now let's use it:

Distance = (1/2) (9.8 m/s² for Earth gravity) (1.2 seconds)²

Distance = (4.9 m/s²) (1.44 sec²)

Distance = (4.9 x 1.44) (m-s² / s²)

Distance = 7.06 meters

see earlier

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