How fast is the speed of sound in seconds and miles per hour ?

the correct choice is a .

do not post any more test or exam questions on

wavelength divides in half and speed stays the same.

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

i would say