need question answer 1

   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.

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