A metre -strick of mass 200 g stands vertical on the ground .Work done to the make it lie horizontal on the ground is
zero
0.2J
1.96J
0.98J
A body of mass 2 kg moves linearly at the speed of 10 ms-1 .A force F is applied on it due to which it moves with a speed of 20 ms-1 ,after covering a distance 3m .The magnitude of F is
100 N
10N
33.3 N
19.6 N
A mettalicsphere and a football with a same kinetic enregy are brought to rest by the application of the same retarding force.Assume no friction between the surfaces
The football will come to rest in a shorter time
The sphere will come to rest in a shorter time
Both will come to rest in a shorter time
Sphere will cover shorter distance
Consider a one-dimensional elastic collision between an incomming body P of mass m1 and another body Q of mass m2 initially at rest .for body Q to move with the greatest kinetic energy after the collision
m1>m2
m1<m2
m1=m2
the body P must recoil back
A body of mass 1 kg falls from a height 1 m on the ground and it strikes the ground after time t.The momentum of the body is
2g
\(2\sqrt g\)
\(\sqrt{2g}\)
\(\sqrt g\)
A collision is said to be elastic if
elastic bodies collide
inelastic bodies collide
total linear momentum is conserved
total energy before and after the collision remains the same
A body of mass 8 kg at rest is situated at 20 m from the ground.If it is released till its kinetic energy becomes equal to potential energy ,its velocity at that instant would be
14 ms-1
9.8 ms-1
196 ms-1
392 ms-1
For a body falling freely ,the ratio between potential enegy (P) and kinetic energy (K) at a given instant is 5:1 .When the velocity of the body increases by 100% ,the ratio \(P\over K\) at that instant is
1:1
1:2
1:5
2:1
In an elastic collision
velocity always remains constant
linear momentum of each particle remains constant
loss in kinetic enregy equals the amount of workdone
total kinetic energy of the particles comprising the system remains constant
Law of conservation of linear momentum is applicable even in those cases where
Newton's first law of motion does not hold good
Newton's second law of motion does not hold good
Newton's third law of motion does not hold good
None of these
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