Advertisements
Advertisements
Question
A force is applied on a body of mass 20 kg moving with a velocity of 40 ms−1. The body attains a velocity of 50 ms−1 in 2 seconds. Calculate the work done by the body.
Advertisements
Solution
Work done, W =`1/2` m (v22 − v12)
=`1/2xx20(50^2-40^2)`
= 9000 J
RELATED QUESTIONS
A boy of weight 40 kgf climbs up the 15 steps, each 15 cm high in 10 s and a girl of weight 20 kgf does the same in 5 s. Compare:
- the work done, and
- the power developed by them. Take g = 10 N kg-1.
When is the work done by a force on a body : (a) positive, (b) negative, and (c) zero?
Define the term 'work'. Write the formula for the work done on a body when a force acts on the body in the direction of its displacement. Give the meaning of each symbol which occurs in the formula.
How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?
Each of the following statement describes a force acting. Which force is causing work to be done?
Ravi applied a force of 10 N and moved a book 30 cm in the direction of the force. How much was the work done by Ravi?
Name the force acting away from the centre of circular path.
What is the work done when the object acted upon by a force remains at rest?
Fill in the boxe to show the corresponding energy transformation.
