A body of mass 1 kg is thrown upwards wi...

A body of mass `1 kg` is thrown upwards with a velocity `20 ms^(-1)`. It momentarily comes to rest after attaining a height of `18 m`. How much energy is lost due to air friction? `(g = 10 ms^(-2))`

30 J

40 J

10 J

20 J

Text Solution

Verified by Experts

The correct Answer is:

Kinetic energy = P.E + energy consumed by air friction .
Loss in energy to air friction ` = 1/2mv^(2) -mgh`
`= 400/2 - 180 =20 J `

Topper's Solved these Questions

WORK, ENERGY AND POWER
MODERN PUBLICATION|Exercise Objective Type Questions (JEE (Main) & Other State Boards for Engineering Entrance)|31 Videos
WORK, ENERGY AND POWER
MODERN PUBLICATION|Exercise Objective Type Questions (JEE (Advanced) for IIT Entrance)|7 Videos
WORK, ENERGY AND POWER
MODERN PUBLICATION|Exercise Objective Type Questions (A. Multiple Choice Questions)|29 Videos
WAVES
MODERN PUBLICATION|Exercise CHAPTER PRACTICE TEST|14 Videos

Similar Questions

Explore conceptually related problems

A body of mass 10 kg initially at rest acquires velocity 10 ms^(-1) . What is the work done ?

An object moving with a velocity of 50 ms^(-1) comes to rest after 20 s. What is its initial velocity ?

A particle of mass 2 kg is projected vertically upward with a velocity of 20 m/s . It attains maximum height of 17 m. The loss in mechanical energy due to air drag is (g = 10 ms^-2 )

A body of mass 500 g is thrown upwards with a velocity 20 ms^-1 and reaches back to the surface of a planet after 20 sec . Then the weight of the body on that planet is (Assume g to be constant) xN. Find x.

A stone of mass 1 kg is thrown with a velocity of 20ms^(-1) across the frozen surface of a lake and it comes to rest after travelling a distance of 50m. What is the magnitude of the force opposing the motion of the stone?

A stone of 1kg is thrown with a velocity of 20 ms^(-1) across the frozen surface of lake and comes to rest after travelling a distance of 50m . What is the force of friction between the stone and the ice?

A stone of 1 kg is thrown with a velocity of 20ms^(-1) across the frozen surface of a lake and comes to rest after travelling a distance of 50 m. What is the force of friction between the stone and the ice ?

MODERN PUBLICATION-WORK, ENERGY AND POWER -Objective Type Questions (B. Multiple Choice Questions)

A body of mass 3 kg is under a constant force which causes a displacem...
Text Solution
|
300J of work is done in slinding a 2 kg block up an inclined plane of ...
Text Solution
|
A body of mass 1 kg is thrown upwards with a velocity 20 ms^(-1). It m...
Text Solution
|
A ball moving with velocity 2 ms^(-1) collides head on with another st...
Text Solution
|
The kinetic energy of a body becomes four times its initial value.The ...
Text Solution
|
If the potential energy of a spring is V on stretching it by 2 cm, the...
Text Solution
|
The potential energy of a body is given by U = A - Bx^(2) (where x is ...
Text Solution
|
An open knife of mass m is dropped from a height h on a wooden floor. ...
Text Solution
|
An elevator is run by the cables at constant speed . The total work d...
Text Solution
|
A stationary partical explodes into two partical of a masses m(1) and ...
Text Solution
|
A neutron makes a head-on elastic collision with a stationary deuteron...
Text Solution
|
A mass of 0.5 kg moving with a speed of 1.5 m//s on a horizontal smoot...
Text Solution
|
A radioactive nucleus of mass number A, initially at rest, emits an al...
Text Solution
|
A bomb of mass 3.0 kg explodes in air into two pieces of masses 2.0 kg...
Text Solution
|
The particle executing simple harmonic motion has a kinetic energy K(0...
Text Solution
|
An engine pumps water continously through a hose. Water leave the hose...
Text Solution
|
The potential energy of a system increased if work is done
Text Solution
|
An object of mass 500 g , initially at rest , is acted upon by a vari...
Text Solution
|
Two sphere A and B of masses m(1) and m(2) respectivelly colides. A is...
Text Solution
|
The potential energy of a particle in a force field is: U = (A)/(r^(...
Text Solution
|