Two objects, one of mass m and the other of mass 2m, are dropped from the top of a building. If there is no air resistance, when they hit the ground
A) both will have the same kinetic energy.
B) the heavier one will have twice the kinetic energy of the lighter one.
C) the heavier one will have four times the kinetic energy of the lighter one.
D) the heavier one will have half the kinetic energy of the lighter one.
E) the heavier one will have one-fourth the kinetic energy of the lighter one.
Question 2
A phototube has a stopping potential of 2.80 V when the cathode is illuminated with bichromatic light of 400 nm and 600 nm wavelengths. The maximum speed of the emitted photoelectrons, in SI units, is closest to:
A) 9.9 105
B) 9.3 105
C) 1.1 106
D) 1.2 106
E) 1.3 106
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Colour the objects