Last Updated On [03-11-2023]
In the given curved road, if particle is released from 
then
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|
a) |
Kinetic energy at |
b) |
Kinetic energy at |
|
c) |
Kinetic energy at |
d) |
Kinetic energy at |
Question ID - 50852 :- In the given curved road, if particle is released from then
a)
Kinetic energy at 
must be 
b)
Kinetic energy at 
may be zero
c)
Kinetic energy at 
must be less than 
d)
Kinetic energy at 
must not be equal to zero
In the given curved road, if particle is released from then
|
a) |
Kinetic energy at |
b) |
Kinetic energy at |
|
c) |
Kinetic energy at |
d) |
Kinetic energy at |
(b)
1. If the surface is smooth then the kinetic energy at 
never be zero
2. If the surface is rough, the kinetic energy at 
be zero. Because, work done by force of friction is negative. If work done by friction is equal to 
then, net work done on body will be zero. Hence, net change in kinetic energy is zero. Hence, (b) is correct
3. If the surface is rough, the kinetic energy at 
must be lesser than 
. If surface is smooth, the kinetic energy at 
is equal to 
4.The reason is same as in (a) and (b)
Next Question :
The average weight of 8 men increased by 1.5 kg when one of the men, who is 65 kg replaced by a new man is
(a) 70 kg (b) 74 kg (c) 76 kg (d) 77 kg
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