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1. An object starts from sleep and accelerates by 5.0 m/s2 for 4.0 seconds, after which...

1. An object starts from sleep and accelerates by 5.0 m/s2 for 4.0 seconds, after which they travel at constant speed for 6.0 seconds and then lower the speed to zero by lowering the speed by 6.0 m/s every second. How long has the object travelled? Show how you calculated it please.

2. A box is repelled at an initial speed of 8.0 m/s. The kinetic coefficient of friction between the box and the substrate is 0.20. Calculate the braking distance if the plane

a) is horizontal

b) tilts upwards of 30° towards the horizontal.

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