Superman is off to visit Lois lane. He sees he's late and increases his flying speed. I know he defies the laws of physics anyway, but let's pretend, okay? If our lead-phobic super hero accelerates uniformly from 1210 m/s to 1600 m/s in 0.40 seconds, then what is his rate of acceleration

975 m/s^2

Explanation:

The formula for rate of acceleration is

(Final velocity - intial velocity)/ time taken

If you plug in your data you will get 975 m/s^2

(1600 m/s -1210 m/s )/.4 s = 975 m^2

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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