LON-CAPA HOMEWORK 10 Exam Questions With Correct Answers.
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Course
CAPA
Institution
CAPA
LON-CAPA HOMEWORK 10 Exam
Questions With Correct Answers.
A ball of mass 3 kg is uniformly accelerated from rest and travels 48 m in 4 s. What is its final
kinetic energy after 4 s? - answerFirst: Calculate the acceleration of the ball using ∆x = ½at².
Second: Use the acceleration to find t...
LON-CAPA HOMEWORK 10 Exam
Questions With Correct Answers.
A ball of mass 3 kg is uniformly accelerated from rest and travels 48 m in 4 s. What is its final
kinetic energy after 4 s? - answer✔✔First: Calculate the acceleration of the ball using ∆x = ½at².
Second: Use the acceleration to find the force acting on the ball, and then remember that the
change in Kinetic Energy equals the net work done on it (W = F∆x). (Don't worry about initial
because it starts at rest)
ANS: 864 J
A 1-kg ball in the air has an initial velocity vi = [ 20 ] i + [ -30 ] j m/s. It falls for a total time of 1
s. Assume that positive x-values are to the right and positive y-values are upward.
What is the initial momentum pi of the ball? - answer✔✔Remember that the initial momentum
pi = mvo = [ mvxo ] i + [ mvyo ] j.
ANS: [20]i + [-30] j kg/m*s
A 1-kg ball in the air has an initial velocity vi = [ 20 ] i + [ -30 ] j m/s. It falls for a total time of 1
s. Assume that positive x-values are to the right and positive y-values are upward.
What is the impulse or change in momentum ∆p of the ball? - answer✔✔Remember that the
impulse I = ∆p = F∆t = [-mg∆t] j. (no i component). The force is gravity in the negative y-
direction.
ANS: [0]i + [-10] j kg/m*s
A 1-kg ball in the air has an initial velocity vi = [ 20 ] i + [ -30 ] j m/s. It falls for a total time of 1
s. Assume that positive x-values are to the right and positive y-values are upward.
What is the final momentum pf of the ball? - answer✔✔Remember that the final momentum pf =
pi + ∆p = [ pxi ] i + [ pyi + ∆py ] j. Note that ∆px = 0 in this problem since no force acts in the x-
direction.
ANS: [20]i + [-40] j kg/m*s
A 1-kg ball in the air has an initial velocity vi = [ 20 ] i + [ -30 ] j m/s. It falls for a total time of 1
s. Assume that positive x-values are to the right and positive y-values are upward.
What is the initial kinetic energy Ki of the ball? - answer✔✔Remember that the initial kinetic
energy Ki = (pxi² + pyi²)/2m
ANS: (400 + 900)/2*1 ==> 650 J
A 1-kg ball in the air has an initial velocity vi = [ 20 ] i + [ -30 ] j m/s. It falls for a total time of 1
s. Assume that positive x-values are to the right and positive y-values are upward.
What is the final kinetic energy Kf of the ball? - answer✔✔Remember that the final kinetic
energy Kf = (pxf2 + pyf2)/2m.
ANS: (400 + 1600)/2*1 ==> 1000 J
A 1-kg ball in the air has an initial velocity vi = [ 20 ] i + [ -30 ] j m/s. It falls for a total time of 1
s. Assume that positive x-values are to the right and positive y-values are upward.
What is the change in kinetic energy ∆K of the ball? - answer✔✔Remember that the change in
kinetic energy ∆K = Kf − Ki.
ANS: 1000 J - 650 J = 350 J
A 1-kg ball in the air has an initial velocity vi = [ 20 ] i + [ -30 ] j m/s. It falls for a total time of 1
s. Assume that positive x-values are to the right and positive y-values are upward.
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