Question

-A werewolf of mass (m1=15 kg) naps atop a skateboard of mass (m2=5 kg) that is lying at rest precariously close to the edge of the Grand Canyon. Suddenly, a vampire of mass (m3=2 kg) emerges from the bushes and runs towards the napping werewolf with a constant speed of (v=10.8 m/s). Letting the direction of the running vampire's inital velocity be the positive direction, what is the running vampire's initial momentum? (Give your answer to 3 sig figs. and give your units for momentum in kg*m/s)  

-The running vampire arrives at the skateboard with his same initial speed (v) and digs his fangs into the napping werewolf, making them move as a single entity on the skateboard. What is the final momentum of the pair of creatures on the skateboard? (Give your answer to 3 sig figs. and give your units for momentum in kg*m/s)

-What is the final speed of the pair of creatures/skateboard combo? (Give your answer to 3 sig figs.)

-What is the change in kinetic energy during this collision? (Give your answer to 3 sig figs. and give your units for KE with the letter J [which respresents Joules]. Indicate whether the change is positive or negative with the sign of your answer)

-The creatures sail right of the edge of the cliff with their same final velocity you calculated above in the horizontal direction. If the depth of the Grand Canyon is 1857 m at this point, how far in the horizontal direction from the base of the cliff do the creatures land? (Give your answer to 3 sig figs.)