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Question
A projectile is thrown with speed u into air from a point on the horizontal ground at an angle θ with the horizontal. If the air exerts a constant horizontal resistive force on the projectile then select correct alternative (s).
A projectile is thrown with speed u into air from a point on the horizontal ground at an angle θ with the horizontal. If the air exerts a constant horizontal resistive force on the projectile then select correct alternative (s).
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Solution
The correct options are
B The time for ascent equals the time for descent
C The path of the projectile may be parabolic.
D The path of projectile may be straight line.
Ascent and descent both are vertical direction motion. So time for both ascent and descent depend on vertical motion parameter. Since vertical acceleration (ay=g) only, therefore time taken by ball for upward motion will be equal to that for downward motion.
The path of the projectile will be straight line if the velocity vector and net acceleration are collinear. In case if they are not collinear, then the path of the projectile will be parabolic.
B The time for ascent equals the time for descent
C The path of the projectile may be parabolic.
D The path of projectile may be straight line.
Ascent and descent both are vertical direction motion. So time for both ascent and descent depend on vertical motion parameter. Since vertical acceleration (ay=g) only, therefore time taken by ball for upward motion will be equal to that for downward motion.
The path of the projectile will be straight line if the velocity vector and net acceleration are collinear. In case if they are not collinear, then the path of the projectile will be parabolic.
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