A student sits in the school bus traveling to her school. If the student stands up and moves at 1.5m/s toward the rear of the bus that travels at 10m/s to the east,what is her velocity relative to the observer on the side of the road? If she moves at 2.1 m/s toward the front of the bus traveling at 15 m/s east, what is her velocity relative to the observer on the side of the road?

(I feel if I get guidance on the first part the 2nd I could do by myself)

a. V = -1.5 + 10 = 8.5 m/s, East.

b. V = 2.1 + 15 = 17.1 m/s, East.