An 8.0 kg object moving to the right at 6.0 m/s suffers a head on collision with a 4 kg mass moving at 9.0 m/s to the left. After collision, the 8.0 kg object bounces back at 4.0 m/s. Is this collision elastic or inelastic? Justify your answer with calculations.

im sorry i dont know

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

your answer would be b. he increased the speed.