its about momentum plsss help

6. Hobbes, the stuffed tiger, has a mass of 10 kg. Calvin, the little boy, has a mass of 25 kg. In a game of football, Hobbes runs at Calvin at 7 m/s. Calvin is running at Hobbes. a. If the two collide, stick together, and are then at rest, what was Calvin's initial velocity? b. What impulse is exerted on Hobbes by Calvin? c. What impulse is exerted on Calvin by Hobbes? Hobbes? d. If the collision occurred in 0.06 seconds, what force was exerted on