please help me out with questions 6&7 I have 35 minutes left please please as quickly as possible

Question 6 (1 point) i Listen A uniform solid sphere of mass 6.50 kg and diameter 28.0 cm starts from rest and rolls without slipping down a 25.0 incline that is 6.50 m long. Calculate the linear speed of the center of the sphere when it reaches the bottom of the incline. assume 8 = 9.8 m/52. Your Answer: Answer units Question 7 (1 point) Listen A 2.75 kg object traveling at 6.80 m/s collides head-on with a 4.75 kg object initially at rest. If the collision is perfectly elastic, what is the final speed of the 2.75 kg object? Your Answer: Answer units