In a billiards game, the cue ball of mass m travelling with velocity 2.8 m/s in the positive x-direction hits the stationary 9-ball also of mass m. after the collision, the 9-ball moves off at an angle of 30 degrees above the positive x-axis while the cue-ball moves off at an angle of 60 degrees below the positive x-axis. what speed does the cue ball have after the collision? a) 2.8 m/sb) 1.4 m/sc) 0.4 m/sd) 2.4 m/se) 0.7 m/s

1.195000

explanation:

total mass=0.0117+0.0137+0.0881+0.0111

total mass= 0.01172kg

total velocity = 0.283-0.743+0.871-0.799+0.155+0.637+0.301=0.102

momentum=mv=0.1172*0.102=1.195000//

electrical potential energy =0.072 j

explanation:

electrical potential energy is given by

u= q δv

q= charge=6 c

δv= potential difference and is given by

δv= e d

e= electric field

d= distance=5 mm=0.005 m

δv=2.4 (0.005)=0.012 v

now electric potential energy= u= q δv

u=6 (0.012)

u=0.072 j