4. If a galaxy is 300,000 light years from Earth. How long did it take for light from that galaxy to reach Earth?
c. 300,000 years
300 days
d. 300,000,000 years
b.
300 years

yup its correct its: c) b b

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