The ball’s speed is 54 km/h.
The ball is deflected backwards to a total angle of 450 degrees.
The initial momentum of the ball is mucosӨ = (0.15 x 54 x 1000 x cos 22. 5)/3600
= 0.15 x 15 x 0.9239 along NO
The ball’s final momentum is mucos along ON.
2mucos = 2 x 0.15 x 15 x 0.9239 = 4.16 kg.m/s Impulse = change in momentum = mucos – (-mucos) = 2mucos = 2 x 0.15 x 15 x 0.9239 = 4.16 kg.m/s