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A body of mass m is projected with a speed v making an angle thita with the vertical what is the change in momentum of body along x axis.

A body of mass m is projected with a speed v making an angle thita with the vertical what is the change in momentum of body along x axis.
 

Grade:11

1 Answers

Susmita
425 Points
5 years ago
Remenber  that 
momentum=mass×velocity
Or,p=mv
In this case the velocity v makes an angle theta with the vertical.So vertical component or y component of velocity is vy=vcostheta and horizontal component of velocity is vx=vsintheta.
As mass is constant,so change is momentum will correspond to change in velocity.Now velocity changes according to the equation
v=u+ft
In this problem,acceleration f only has a vertical component g(due to earths gravitational field)and there is no acceleration in the horizontal direction(as we have not applied any horizontal force)..So
fy=g and fx=0.
vx=ux+fxt
or,vx=ux
Therefore velocity along x direction does not change during the motion.So there is no change in momentum along x direction.
Please approve the answer if you are helped.

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