Please answer all questions

1. A 0.25-kg snowball moving at 15 m/s [E] collides and sticks with a 1.9-kg toy truck travelling at 2.8 m/s [W]. Calculate the velocity of the snowball-truck system after the collision. [3 marks] 2. A robin of mass 150 g uses 10 J of energy and speeds up to 15 m/s in level flight. Calculate the initial speed of the robin. [3 marks] 3. An 87-g box is attached to a spring with a force constant of 82 N/m. The spring is compressed 11 cm and the system is released. What is the speed of the box when the spring is released? [3 marks]