You push a box at a constant speed of 5m/s and let it go. It stops 1.5s later due to the force of friction. If you push the box at a speed of 12m/s, how long will it take to stop?

the time taken for the box to stop is 3.6 s.

Explanation:

Given;

initial speed with which the box was pushed, u = 5 m/s

time taken for the box to stop, t = 1.5 s

Assuming the box is moving at constant acceleration, a;

When the box is pushed a speed of 12 m/s, the time taken for the box to stop is calculated as;

Therefore, the time taken for the box to stop is 3.6 s.

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explanation:

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray