A 1.5 kg ball is coming straight at a 80 kg soccer player at 15 m/s who kicks it in the exact opposite direction at 25 m/s with an average force of 1200 N. How long are his foot and the ball in contact

A honeybee with a mass of 0.155g lands on one end of a floating 4.03g popsicle stick.If the bee walks with a velocity of 1.28 cm/s relative to the still water, what is the magnitude of the stick's velocity relative to the water?

A 53,000-kg rail car is moving at 2.80 m/s as it approaches a conveyor belt. As it passes under the conveyor, 74,000 kg of gravel is dropped from rest into the railcar. What is the speed of the rail car after the gravel is added? 1.25 m/s 1.31 m/s 1.88 m/s 1.17 m/s 2.26 m/s

An overnight rainstorm has caused a major roadblock. Three massive rocks of mass m₁ = 514 kg, m₂ = 7.00 x 10² kg, and m3 = 366 kg have blocked a busy road. The rocks are lined up from left to right in the order m₁, m2, and m3. The city calls a local contractor to use a bulldozer to clear the road. The bulldozer applies a constant force to m₁ in order to slide the rocks off the road. Assuming the road is a flat, frictionless surface and the rocks are all in contact, what force, FA, must be applied to m₁ to slowly accelerate the group of rocks from the road at 0.400 m/s²? Use the value for FA to find the force, F12, exerted by m₁ on m₂. FA = F12 = N N