1.
A 75 kg man climbs a staircase with a height of 4 m. What is the work done against gravity?
A
300 J
B
750 J
C
3000 J
D
4000 J
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A 75 kg man climbs a staircase with a height of 4 m. What is the work done against gravity?
300 J
750 J
3000 J
4000 J
When a ball is thrown upward, its kinetic energy is converted into?
Electrical energy
Potential energy
Heat energy
Chemical energy
The total energy of a body is the sum of which two forms of energy?
Work and energy
Heat and work
Kinetic and potential energy
Chemical and electrical energy
What is the condition for work to be done by a force?
The force must be zero
There must be a displacement in the direction of the applied force
The object must be at rest
The displacement must be perpendicular to the force
If the displacement is zero, what is the work done by the force?
Infinite
Negative
Zero
Positive
A car of mass 1000 kg is moving at a speed of 20 m/s. What is its kinetic energy?
200 kJ
400 kJ
100 kJ
300 kJ