Bihar Police · General Science
Newton's laws, work, energy and power.
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Q1 · Motion & Energy · EASY
A motorcycle of mass 150 kg is moving with a velocity of 20 m/s. What is its kinetic energy?
Q2 · Motion & Energy · EASY
A force of 50 N is applied on a body which moves it through a distance of 8 m in the direction of the force. Calculate the work done by the force.
Q3 · Motion & Energy · MEDIUM
A machine lifts a load of 300 kg to a height of 10 m in 15 seconds. What is the power of the machine? (Take g = 10 m/s²)
Q4 · Motion & Energy · MEDIUM
A body of mass 5 kg initially at rest is acted upon by a net force of 20 N for 4 seconds. According to Newton's second law, what will be the final velocity of the body?
Q5 · Motion & Energy · EASY
A car moving with a velocity of 20 m/s comes to rest after 5 seconds when brakes are applied. What is the retardation of the car?