A61-kg acrobat must jump high and land on his brother's shoulders. to accomplish this, he leaps from a crouched position to a height where his center of mass is 1.20 m above the ground. his center of mass is 400 mm above the ground. part a: what is the average force exerted on him by the ground during the jump? part b: what is his maximum speed?

What is the role of lenses in microscopy?

Which of these statements best explains how the hydrosphere interacts with the atmosphere to affect global climate? mountains block rain clouds and cause changes in global rainfall and evaporation. humans burn fossil fuels to produce greenhouse gases which cause global warming. humans cut down trees which affects the amount of oxygen in different parts of the globe. greenhouse gases, like carbon dioxide, dissolve in oceans and prevent global warming.

Agirl throws a ball. if the ball's acceleration is 12 m/sec/sec and its mass is 0.5 kg, how much force did the girl apply to the ball?