Part A A 0.034-kg pet lab mouse sits on a 0.35-kg air-track cart, as shown in (Figure 1). The cart is at rest, as is a second cart with a mass of 0.25 kg. The lab mouse now jumps to the second cart. After the What is the speed v2 of the mouse and the 0.25-kg cart? jump, the 0.35-kg cart has a speed of v1 = 0.81 m/s. Express your answer to two significant figures and include appropriate units. HA ? Value Units Submit Request Answer Figure Provide Feedback 0.35 kg 0.25 kg (a) Before the jump U2 0.35 kg 0.25 kg (b) After the jump