The minimum work done in pulling up a block of wood weighing \(2\) kN for a length of \(10\) m on a smooth plane inclined at an angle of \(15^\circ\) with the horizontal is (given: \(\mathrm{sin}15^\circ=0.2588\)):
1. \(4.36\) kJ
2. \(5.17\) kJ
3. \(8.91\) kJ
4. \(9.82\) kJ

Subtopic:  Work done by constant force |
 79%
From NCERT
PMT - 2003
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A person-1 stands on an elevator moving with an initial velocity of 'v' & upward acceleration 'a'. Another person-2 of the same mass m as person-1 is standing on the same elevator. The work done by the lift on the person-1 as observed by person-2 in time 't' is:

1.  mg + avt + 12at2

2.  -mgvt + 12at2

3.  0

4.  mavt + 12at2

Subtopic:  Work done by constant force |
 78%
From NCERT
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A block of mass m is placed in an elevator moving down with an acceleration g3. The work done by the normal reaction on the block as the elevator moves down through a height h is:

1.  -2mgh3

2.  -mgh3

3.  2mgh3

4.  mgh3

Subtopic:  Work done by constant force |
 66%
From NCERT
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A particle moves from a point -2i^+5j^ to 4j^+3k^ when a force of  4i^+3j^ N is applied. How much work has been done by the force?

1. 8 J 2. 11 J 
3. 5 J 4. 2 J
Subtopic:  Work done by constant force |
 68%
From NCERT
NEET - 2016
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In the diagram shown, force F acts on the free end of the string. If the weight W moves up slowly by distance h, then work done on the weight by the string holding it will be: (Pulley and string are ideal)

1. Fh

2. 2Fh

3. Fh2

4. 4Fh

Subtopic:  Work done by constant force |
 67%
From NCERT
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The position of a particle (x) varies with time (t) as \(x = (t - 2)^2\), where x is in meters and t is in seconds. Calculate the work done during t = 0 to t = 4 s if the mass of the particle is 100 g. 
1.  0.4 J
2.  0.2 J
3.  0.8 J
4.  Zero

Subtopic:  Work done by constant force |
 61%
From NCERT
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The position-time graph of a particle of mass 2 kg is shown in the figure. Total work done on the particle from t = 0 to t = 4s is:
      

1. 8 J 2. 4 J
3. 0 J 4. Can't be determined
Subtopic:  Work done by constant force |
 57%
From NCERT
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A bicyclist comes to a skidding stop in \(10\) m. During this process, the force on the bicycle due to the road is \(200\) N is directly opposed to the motion. The work done by the cycle on the road is:
1. \(+2000\) J
2. \(-200\) J
3. zero
4. \(-20000\) J

Subtopic:  Work done by constant force |
 58%
From NCERT
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A cord is used to vertically lower a block of mass m by a distance d at a constant downward acceleration of 'g'4. The work done by the chord on the block will be:

1.  34mgd

2.  -34mgd

3.  14mgd

4.   -14mgd

Subtopic:  Work done by constant force |
 68%
From NCERT
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Forces acting on a particle have magnitudes of 14, 7, and 7 N and act in the direction of vectors \(6\hat{i} + 2\hat{j} + 3\hat{k}\)\(3\hat{i} - 2\hat{j} + 6\hat{k}\)\(2\hat{i} - 3\hat{j} - 6\hat{k}\) respectively. The forces remain constant while the particle is displaced from point A: (2, –1, –3) to B: (5, –1, 1). The coordinates are specified in meters. The work done equal to:

1. 75 J 

2. 55 J 

3. 85 J 

4. 65 J

Subtopic:  Work done by constant force |
From NCERT
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