A golf ball of mass 45.9g is hit from a tee with speed 180km/h . The ball rises to a height of 20m, having traveled along a curved path of length 61.875m. At the highest point of its path the ball is travelling at 144km/h.
a) Find the magnitude of the avg resistance acting on the ball
I calculated this and got resistance = 0.2N
The ball travels a further 105.8m along a curved path to land on the green. The green is 4m lower than the tee. The average resistance remains unchanged.
b) find the speed of the ball just before it lands on the green
Iam getting the ans v= 36m/ s but the textbook ans is 35m/s
m= 0.0459kg, u= 40m/s, s= 105.8- 61.875=43.925m, v=?
Increase in KE = 0.02295v^2-36.72J
Increase in GPE= mgh =-1.836J
Work done against resistance =-8.785J
When I do total mechanical energy = total work done, I get v= 36m/s