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An object is thrown upwards with a speed of 13m/s. How long does it take to reach a height of 4.0m above the projection point while descending?

A 1000kg barge is being towed by means of two horizontal cables. One cable is pulling with a force of 80.0N in a direction 30.0 degrees west of north. In what direction should the second cable pull so that the barge will accelerate northward, if the force exerted by the cable is 120N? The...

What average force is required to accelerate a car with a mass of 1200kg from 0 to 27.0m/s in 10 seconds?