Advertisements
Advertisements
Question
A body of mass 60 kg has the momentum 3000 kgm/s-1. Calculate: the speed of the body.
Advertisements
Solution
Mass of body = 60 kg
Momentum, p=3000 kgm/s
Momentum = mass x velocity
3000 = 60 x velocity
Velocity =50 m/s
RELATED QUESTIONS
A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?
Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.
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 :
Choose one or more correct alternatives.
For work to be performed, energy must be ______.
- transferred from one place to another
- concentrated
- transformed from one type to another
- destroyed
P, Q and R are three forces which act as shown in fig.

The point O lies in the same plane. Given, P = Q = R = 10N
(i) Which force has the least moment about O? Give a reason.
(ii)Which force has the greatest moment about O? Give a reason.
A man carrying a suitcase in his hand is walking horizontally. What is the work done against gravity?
Name the physical quantity whose MKS units are kgm2s-3.
A ______ should act on an object.
A proton is kept at rest. A positively charged particle is released from rest at a distance d in its field. Consider two experiments; one in which the charged particle is also a proton and in another, a positron. In the same time t, the work done on the two moving charged particles is ______.
