An 20-kg bicycle carrying a girl is traveling at a speed of 7 m/s. What is the kinetic energy of the girl and bicycle? Write formula, plug in numbers, show squared step, give answer with units

Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells? burning fossil fuels contributes to climate change. burning fossil fuels takes place inside expensive fuel cells. fossil fuels aren't widely available, but pure hydrogen is. fossil fuels are nonrenewable.

The boy of mass 30 kg is at r1= 2 meters from the fulcrum. of the girl is 45 kg, at what r2 must she sit so that they are balanced ?

Will mark as brainliest how does a catapult increase the trajectory of an object? ps. answer as if u were a 5th grader