A force F=5i^+6j^4k^ acting on a body, produces a displacement s=6i+5k. Work done by the force is 

(1) 18 units

(2) 15 units

(3) 12 units

(4) 10 units

Concept Questions :-

Concept of work
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A body of mass 6kg is under a force which causes displacement in it given by S=t24 metres where t is time. The work done by the force in 2 seconds is-

(1) 12 J

(2) 9 J

(3) 6 J

(4) 3 J

Concept Questions :-

Work done by variable force
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A force of (3​ i^+4j^) Newton acts on a body and displaces it by (3i^+4j^)m. The work done by the force is 

(1) 10 J

(2) 12 J

(3) 16 J

(4) 25 J

Concept Questions :-

Concept of work
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A force F=6i^+2j^3k^ acts on a particle and produces a displacement of s=2i^3j^+xk^. If the work done is zero, the value of x is 

(1) – 2

(2) 1/2

(3) 6

(4) 2

Concept Questions :-

Concept of work
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A particle moves from position r1=3i^+2j^6k^ to position r2=14i^+13j^+9k^ under the action of force 4i^+j^+3k^N. The work done will be 

(1) 100 J

(2) 50 J

(3) 200 J

(4) 75 J

Concept Questions :-

Concept of work
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A force (F)=3i^+cj^+2k^ acting on a particle causes a displacement: (s)=4i^+2j^+3k^ in its own direction. If the work done is 6 J then the value of ‘c’ is 

(1) 0

(2) 1

(3) 6

(4) 12

Concept Questions :-

Concept of work
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A force F=(5i^+4j^)N acts on a body and produces a displacement S=(6i^5j^+3k^)m. The work done will be 

(1) 10 J

(2) 20 J

(3) 30 J

(4) 40 J

Concept Questions :-

Concept of work
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A uniform chain of length 2m is kept on a table such that a length of 60cm hangs freely from the edge of the table. The total mass of the chain is 4kg. What is the work done in pulling the entire chain on the table 

(1) 7.2 J

(2) 3.6 J

(3) 120 J

(4) 1200 J

Concept Questions :-

Gravitational Potential energy
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A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle, the motion of the particle takes place in a plane. It follows that 

(1) Its velocity is constant

(2) Its acceleration is constant

(3) Its kinetic energy is constant

(4) It moves in a straight line

Concept Questions :-

Concept of work
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A force F=(5i^+3j^+2k^)N is applied over a particle which displaces it from its origin to the point r=(2i^j^)m. The work done on the particle in joules is 

(1) – 7

(2) +7

(3) +10

(4) +13

Concept Questions :-

Concept of work
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