Work, Power and EnergyHard
Question
The kinetic energy of a particle continuously increase with time. Then
Options
A.the magnitude of its linear momentum is increasing continuously.
B.its height above the ground must continuously decrease.
C.the work done by all forces acting on the particle must be positive .
D.the result ant force on the particle must be parallel to the velocity at all times.
Solution
For (A) p = 
if K ↑ then p ↑
For (B) Its height may ↑ or ↓
For (C) W = ᐃK if ᐃK = positive then W = positive
For (D) The resultant force on the particle must be at angle less than 90o at all times.
if K ↑ then p ↑For (B) Its height may ↑ or ↓
For (C) W = ᐃK if ᐃK = positive then W = positive
For (D) The resultant force on the particle must be at angle less than 90o at all times.
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