What are supersonic speeds?

speeds at 343 m/s exactly

speeds above 343 m/s

speeds below 343 m/s

speeds exactly at the speed of sound

The answer is: B.

speeds above 343 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