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Answer:
Direction remains the same but velocity changes.
Explanation:
This tell us about the direction and magnitude of the acceleration acting on the cannonball throughout its duration of flight that its direction remains the same but its magnitude of the acceleration is continuously changing. The cannonball moves in the direction in which the cannon was fired while the velocity is highest after the fire but decreases when goes higher and when it comes back to the ground so its velocity increases against so we can say that both positive and negative acceleration occurs. Positive acceleration means increase in the magnitude of velocity whereas negative acceleration means decrease in velocity.
Answer:
the greater the height of an object the *greater* its gravitational potential energy
greater
Part a)
Power rated on the elevator is given as
now the mass that is lifted above is given as
height of the elevator lifted is
now the potential energy is given as
now power is defined as rate of energy
so it will take 13.5 s to lift up
Part b)
Electrical energy used
so electrical energy used in this process will be 120050 J
