A .0.40 kg soccer ball approaches a player horizontally with a velocity of 18 m/s to the north. The player strokes the ball and causes it to move in the opposite direction with a velocity of 22 m/s. what impulse was delivered to the ball by the player?
How It Works
InstaEDU makes it easy to find a great tutor and connect instantly
Connect with the perfect tutor, anytime 24/7
Never get stuck on homework again. InstaEDU has awesome tutors instantly available around the clock.
Work together with the best lesson tools
Our lesson space lets you use video, audio or text. Upload any assignment and work through it together.
Try it free—then lock in a super low rate
Anyone can try InstaEDU for up to 2 hours for free. After that, rates start at just 40¢/minute.
Thanks for connecting to InstaEDU with Facebook! You're almost done!
Please complete the fields below to finish setting up your account.
Physics QuestionsA student asked for help with:
To make a slight correction on Stephen's answer. Impulse is F*t, the force applied to something multiplied by how long the force is applied (or more generally the integral of F dt, but this needs not concern us). However, we know that the change in the momentum of a system is equal to the impulse added to the system: momentum is equal to m*v, where m is mass and v is velocity.
His calculation then works. We have a change in momentum of (v1-v0)(m)=18–(–22)(0.4)=40*0.4=16, so the impulse must be 16.
Just remember to distinguish the concepts of impulse and momentum, even though they coincide in practice.
Impulse is defined as the change in velocity multiplied by the mass of the object.
So our mass is 0.4 kg
our Initial velocity is 18 m/s
and our final velocity is 22 m/s in the OPPOSITE direction.
Therefor, our change in velocity is positive 18 m/s minus negative 22 m/s. Giving us a total change in velocity of 40 m/s
Multiply this by 0.4 kg, and we get an impulse of 40m/s * 0.4kg = 16 kg*m/s