A runner cover 100 m. in 10 sec. & walk back at 80 sec. , calculate
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Crowbar of 5 metre is used to lift an object of 800 metre if the effort arm is 200cm calculate the force applied

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.

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost