A baby carriage is rolling down a hill at 18 m/s. If the carriage has 90J of kinetic energy, what is the mass of the carriage? a. 5 kg b. 0.56 kg c. 10 kg d. 100 kg

Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. the scale reads 830 n for the first 2.4 s after the elevator starts moving, then 930 n for the next 2.4 s. part a what is the elevator's speed 4.8 s after starting? express your answer with the appropriate units.