Jim measures the side of a box and finds it to be 0.564 meters long. how long is it in centimeters?

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?

When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart

Could someone . i have tried to solve myself but my calculation is off