Two bodies of masses m and 4 m are moving with equal K.E. The ratio of their linear momentums is

(1) 4 : 1

(2) 1 : 1

(3) 1 : 2

(4) 1 : 4

Concept Questions :-

Concept of work
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A particle of mass m1 is moving with a velocity v1 and another particle of mass m2 is moving with a velocity v2. Both of them have the same momentum but their different kinetic energies are E1 and E2 respectively. If m1 > m2 then 

(1) E1 < E2

(2) E1E2=m1m2

(3) E1 > E2

(4) E1 = E2

Concept Questions :-

Concept of work
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Four particles are given, having same momentum. Which one has maximum kinetic energy- 

(1) Proton

(2) Electron

(3) Deutron

(4) α-particles

Concept Questions :-

Concept of work
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If a man increase his speed by 2 m/s , his K.E. is doubled, the original speed of the man is 

(1) (1+22)m/s

(2) 4 m/s

(3) (2+22)m/s

(4) (2+2)m/s 

Concept Questions :-

Concept of work
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A block of mass m initially at rest is dropped from a height h on to a spring of force constant k. The maximum compression in the spring is x then-

(1) mgh=12kx2

(2) mg(h+x)=12kx2

(3) mgh=12k(x+h)2

(4) mg(h+x)=12k(x+h)2

Concept Questions :-

Elastic potential energy
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A spherical ball of mass 20 kg is stationary at the top of a hill of height 100 m. It slides down a smooth surface to the ground, then climbs up another hill of height 30 m and finally slides down to a horizontal base at a height of 20 m above the ground. The velocity attained by the ball is 

(1) 10 m/s

(2) 1030 m/s

(3) 40 m/s

(4) 20 m/s

Concept Questions :-

Gravitational Potential energy
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The block of mass M moving on the frictionless horizontal surface collides with the spring of spring constant K and compresses it by length L. The maximum momentum of the block after collision is 

(1) Zero

(2) ML2K

(3) MKL

(4) KL22M

Concept Questions :-

Elastic potential energy
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A body of mass m accelerates uniformly from rest to v1 in time t1. As a function of time t, the instantaneous power delivered to the body is 

(1) mv1tt1

(2) mv12tt1

(3) mv1t2t1

(4) mv12tt12

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A weight lifter lifts 300 kg from the ground to a height of 2 meter in 3 second. The average power generated by him is 

(1) 5880 watt

(2) 4410 watt

(3) 2205 watt

(4) 1960 watt

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The average power required to lift a 100 kg mass through a height of 50 metres in approximately 50 seconds would be 

(1) 50 J/s

(2) 5000 J/s

(3) 100 J/s

(4) 980 J/s

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