Home
Class 11
PHYSICS
A body of mass 2 kg, initially at rest, ...

A body of mass 2 kg, initially at rest, is moved through 3 m along the horizontal by a force of 10 N acting at an angle of `60^(@)` with the horizontal. The kinetic energy gained by the body is

A

15J

B

20J

C

25J

D

30K

Text Solution

Verified by Experts

The correct Answer is:
A
In the first case, the height of the brick =8cm
The height of its centre of gravity =4cm
In the second case, the height of centre of gravity =10cm
`therefore` The increase in the height of centre of gravity =10-4=6cm
`therefore " Work done "=mg =5 xx 10 xx 6/(100) =3J`
Promotional Banner

Topper's Solved these Questions

  • FORCE, WORK AND TORQUE

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP|10 Videos

  • FRICTIONAL IN SOLIDS AND LIQUIDS

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP|10 Videos

Similar Questions

Explore conceptually related problems

A uniform force of 4 N acts on a body of mass 40 kg for a distance of 2 m. The kinetic energy acquired by the body is

A uniform force of 4 N acts on a body of mass 40 kg for a distance of 2 m. The kinetic energy acquired by the body is

A body of mass 1 kg is initially at rest is moved by a horizontal force of 0.5 Nona smooth frictionless table. The value of work done by this force in 10 s is

A uniform force of 4 N acts on a body of mass 10 kg for a distance of 2.0 m . The kinetic energy acquired by the body is

A body is projected at an angle 60^@ with horizontal with kinetic energy K. When the velocity makes an angle 30^@ with the horizontal, the kinetic energy of the body will be

A block of mass m = 4 kg is dragged 2 m along a horizontal surface by a force F = 30 N acting at 53^(@) to the horizontal. The initial speed is 3 m//s and mu_(k) = 1//8 . Find the change in kinetic energy of the block

If a body of mass 5 kg initially at rest is acted upon by a force of 50 dyne for 3s, then the impulse will be

A body of mass 2 kg initially at rest is moved by a horizontal force of 0.5 N on a smooth frictionless table. Obtain the work done by the force in 8 s and show that this equals the change in kinetic energy of the body.

A block of mass 5 kg is initially at rest on a rough horizontal surface. A force of 45 N acts over a distance of 2 m . The force of friction acting on the block is 25 N . The final kinetic energy of the block is