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#16. The unit of kinetic energy is the:

• AJoule
• BMetre per second
• CWatt
• DNewton-metre per second

#20. Considering Newton's second law of motion: 1- every action has an equal and opposite reaction. 2-If the same force is applied, the larger the mass the slower the acceleration. 3-If two forces are applied to the same mass, the bigger the force the greater the acceleration. 4-the acceleration of a body from a state of rest, or uniform motion in a straight line, is proportional to the applied force and inversely proportional to the mass. The combination of true statements is:

• A1 only
• B1,2,3 and 4
• C2,3 and 4.
• D3 and 4

#24. The definition of momentum is:

• AThe quantity of mass possessed by a body.
• BThe quantity of inertia possessed by a body.
• CThe quantity of motion possessed by a body.
• DThe opposition which a body offers to a change in velocity