# Na two identical balls are dropped from a tall

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[N/A]Two identical balls are dropped from a tall building, one a few seconds after the other. Air resistance isnotnegligible. As the balls fall, the distancebetween the balls willA. decrease.B. increase.C. increase then remain constant.D. remain constant.
Examiners reportC[N/A]Which of the following quantities can be determined from a speed-time graph of a particle travelling in a straight line?
MarkschemeExaminers reportD[N/A]A truck is pulled up an inclined plane at constant speed by an electric motor. The gain in potential energy of the truck is 48 kJ. The eﬃciency of theelectric motor isHow much energy is dissipated in pulling the truck up the plane?.
MarkschemeExaminers reportBCandidates should understand technical language such as ‘dissipated’ even if they are working in a second language.
MarkschemeA football is kicked with an initial velocityat an angleto the horizontal and reaches the groundseconds later.Ignoring air resistance what is the rangeof the football?
Examiners reportMarkschemeExaminers report[N/A]Which of the following is always true for an object moving in a straight line at constant speed?A. No forces act on the object.B. No resultant force acts on the object.C. The momentum of the object is zero.D. No work is being done on the object.BNo work is done only if there are no forces on the object. So clearly the only possible answer is B.A student throws a stone with velocityat an angleto the vertical from the surface of a lake. Air resistance can be ignored. The acceleration due togravity is .
MarkschemeExaminers reportA.B.C.D.DClearly when, so A and C must be incorrect. The relevant equation of motion relatings,v,a,tincludes, so D must be the correctresponse.What is the time taken for the stone to hit the surface of the lake?
MarkschemeExaminers reportC[N/A]If a moving object is subject to a constant force, which of the following can be correctly deduced from Newton’s first law?
Two isolated spherical planets have the same gravitational potential at their surfaces. Which ratio must also be the same for the two planets?

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Term
Fall
Professor
NoProfessor
Tags
Velocity, p, A p, B p t