Alazy physics student is made to walk the plank. the plank is 8m above the water. if the plank is pulled out from under the student and he falls straight down, how long will it take him to hit the water?

How are calculation for velocity and speed different

There are weak or strong attractive forces between atoms of liquids with a high viscosity

1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?