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9. A parachutist is falling through air of 10. Two rocks are spun around in circular
uniform density from a great height. paths at the ends of strings of equal
(g is the acceleration of free fall.) length. What quantity MUST be the
same for both rocks if the tension in
Which of the following graphs show the strings are equal?
how his acceleration varies with time?
(A) Mass
(A) (B) Speed
(C) Acceleration
(D) Kinetic energy

11. Aeroplane A is travelling at twice the
speed of Aeroplane B. Plane A is half
the mass of Aeroplane B. Which of the
(B) following statements is correct?

(A) The two aeroplanes have the
same kinetic energy
(B) Aeroplane A has twice the
kinetic energy of Aeroplane B
(C) Aeroplane A has half the kinetic
energy of Aeroplane B
( C) (D) Aeroplane A has one quarter of
the kinetic energy of
Aeroplane B

( D)

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