Q. 134.3( 163 Votes )

A hockey ball of mass 200 g travelling at 10 ms-1 is struck by a hockey stick so as to return it along its original path with a velocity of 5 ms-1. Calculate the change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.

Answer :

Firstly, we will calculate the initial momentum:

Given,

Mass of hockey ball, m1 = 200 g

(We know that 1kg=1000gram)

= kg

= 0.2 kg

Initial velocity, v1 = 10 m/s (Given)


So,


Initial momentum = m1 × v1
= 0.2 × 10

= 2 kg m/s (i)


Now, we will calculate the final momentum:


Given,


Mass of hockey ball, m2 = 200 g

(We know that 1kg=1000gram)

= 0.2 kg

Final velocity, v2= - 5 m/s (As the ball is going in reverse direction)

So,

Final momentum = m2 × v2

= 0.2 × (-5)

= - 1 kg m/s (ii)


Now,

Change in momentum = Final momentum – Initial momentum

= -1 -2

= (- 3) kg m/s

Therefore, the change in momentum of the hockey ball is 3 kg m/s.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Quiz | Conservation of MomentumQuiz | Conservation of MomentumQuiz | Conservation of Momentum33 mins
Test your knowledge of Laws of motionTest your knowledge of Laws of motionTest your knowledge of Laws of motion44 mins
Quiz | Lets Say Hey to Newton!!!Quiz | Lets Say Hey to Newton!!!Quiz | Lets Say Hey to Newton!!!50 mins
NCERT | Newton's Second LawNCERT | Newton's Second LawNCERT | Newton's Second Law41 mins
Understanding Action-Reaction PairUnderstanding Action-Reaction PairUnderstanding Action-Reaction Pair36 mins
Quiz | Become a Master of Conservation of MomentumQuiz | Become a Master of Conservation of MomentumQuiz | Become a Master of Conservation of Momentum32 mins
What is Impulse?What is Impulse?What is Impulse?44 mins
Lakhmir Singh | Force and Laws of Motion Part-3Lakhmir Singh | Force and Laws of Motion Part-3Lakhmir Singh | Force and Laws of Motion Part-347 mins
Lets understand Circular MotionLets understand Circular MotionLets understand Circular Motion42 mins
Lakhmir Singh | Force and Laws of Motion Part 1Lakhmir Singh | Force and Laws of Motion Part 1Lakhmir Singh | Force and Laws of Motion Part 142 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses