 #1
susan_khan
 6
 0
 Homework Statement:
 A 0.045 kg golf ball is hit by a driver. The head of the driver has a mass of 0.15 kg, and travels at a speed of 56 m/s before the collision. The ball has a speed of 67 m/s as it leaves the clubface. What is the speed of the head of the driver immediately after the collision?
 Relevant Equations:

m1v1+m2v2 = m1v1f + m2v2f
vi1 +v1f = V2i +v2f
A 0.045 kg golf ball is hit by a driver. The head of the driver has a mass of 0.15 kg, and travels at a speed of 56 m/s before the collision. The ball has a speed of 67 m/s as it leaves the clubface. What is the speed of the head of the driver immediately after the collision?
I'm not sure where I'm going wrong but I first started off with this equation: m1v1+m2v2 = m1v1f + m2v2f. I was able to solve for v1f by using this equation and substituting it back into the main problem. (vi1 +v1f = V2i +v2f which equals 11 + v1f = v2f). After substuting this equation into the main equation I got v1f as 50.1 m/s and after subbing this number into this equation 11 + v1f = v2f I got v2f as 61.1 m/s. However the textbook says the answer is 36 m/s. What should I do?
I'm not sure where I'm going wrong but I first started off with this equation: m1v1+m2v2 = m1v1f + m2v2f. I was able to solve for v1f by using this equation and substituting it back into the main problem. (vi1 +v1f = V2i +v2f which equals 11 + v1f = v2f). After substuting this equation into the main equation I got v1f as 50.1 m/s and after subbing this number into this equation 11 + v1f = v2f I got v2f as 61.1 m/s. However the textbook says the answer is 36 m/s. What should I do?