A60 kg bicyclist on a 15 kg bicycle speeds up from 5.0 m/s to 10 m/s what is the total kinetic energy before accelerating?

One object has a mass of 1 kg and another object has a mass of 3 kg. if the speeds are the same, which of the following is true about their kinetic energy?

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

Two pans of a balance are 24.1 cm apart. the fulcrum of the balance has been shifted 1.33 cm away from the center by a dishonest shopkeeper. by what percentage is the true weight of the goods being marked up by the shopkeeper? assume the balance has negligible mass. answer in units of %.