Assignment:
You push with a 20-n horizonal force on a 2-kg mass resting on a horizonal surface. the horizonal frictional force is 12 N . show that the accerleration is 4m/s2.
How many joules of potential energy does 1.5-kg book gain when it is elevated 2 m? when it is elevated 4 m (let g= 10 N/kg)
Calculated the number of joules of kinetic energy a 1-kg parrot has when it flies at 6m/s.