English

A Body of Mass 2 Kg is Moving with a Speed of 20 Ms-1. What is Its K.E.? - Physics

Advertisements
Advertisements

Question

A body of mass 2 kg is moving with a speed of 20 ms-1. What is its K.E.?
Numerical

Solution

K.E = `1/2` mv2

K.E = `1/2`(2) (20)2

or K.E = 400 J

Thus K.E is 400J

shaalaa.com
  Is there an error in this question or solution?
Chapter 1: Force, Work, Energy and Power - Exercise 1.5 i [Page 53]

APPEARS IN

Frank Physics - Part 2 [English] Class 10 ICSE
Chapter 1 Force, Work, Energy and Power
Exercise 1.5 i | Q 11 | Page 53

RELATED QUESTIONS

Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?


State two factors on which the work done on a body depends.


Define the term energy.


If the work done by a force in moving an object through a distance of 20 cm is 24.2 J, what is the magnitude of the force?


The work done by a force acting obliquely is given by the formula : W = F cos θ ✕ s. What will happen to the work done if angle θ between the direction of force and motion of the body is increased gradually? Will it increase, decrease or remain constant.


In case of negative work, the angle between the force and displacement is :


A girl weighing 400 N climbs a vertical ladder. If the value of g be 10 m s−2, the work by her after climbing 2 m will be :


Determine the amount of work done when an object is displaced at an angle of 30° with respect to the direction of the applied force.


The velocity of a car increases from 54 km/hr to 72 km/hr. How much is the work done if the mass of the car is 1500 kg?


The work done on an object does not depend on ______.


Is kinetic energy a scalar or a vector physical quantity?

What is the amount of energy spent by the heart in pumping blood through the body?

What is meant by power?

A woman pulls a bucket of water of total mass 5 kg from a well which is 10 s. calculate the power used by her.


What is meant by the principle of moments?

What do you understand by 'potential energy' and 'Kinetic energy'? Give three examples of each to illustrate your answer.


A water pump raises 80 kg of water through a height of 20 m in 10 s. Calculate the power of the pump.

State larger units of power.


A truck driver can load oil drums into the back of the truck by pushing them up a sloping plank, or by lifting them directly. Each drum has a mass of 80 kg, the plank is 3 m long, and the back of the truck is 0.8 m above the ground.

(i) How much force would be needed to lift a drum into the truck directly/without using the plank? (Take g = 10 m/s2)

(ii) How much energy would be required in lifting the drum into the truck without the plank?

(iii) If the force needed to push the drum up the plank is 300 N, why is this less than the answer to part (i)?

(iv) When the truck is loaded, the driver drives off. List the major energy changes that take place in moving the truck.

(v) The driver has to stop at the factory gates. What happens to the kinetic energy of the truck?


Work done by this force at any instant is ______.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×