hello could you help me understand how to solve these problems. Thank you!

Newton's Laws & Weight Calculations Show work for all calculations and circle or highlight your final answers. 1. A 910 kg racecar starts from rest and reaches a speed of 25.1 m/sin 0.48 s. a. What is the average acceleration of the racecar during this time period? b. What is the magnitude of the net force on the racecar? 2. What is your weight in newtons? 3. If a car weighs 5250 newtons, what is its mass? 4. A 5400 kg helicopter moves upwards with an acceleration of 2.1 m/s?. a. What lift force is exerted by the air on the propellers? b. What force is exerted by the propellers on the air? 5. A ball is rolling with a velocity of 1.9 m/s along a flat surface. After 45 seconds the ball coasts to a stop. a. What acceleration does the ball experience while stopping? b. What is the magnitude of the force friction applies to the ball to cause it to stop if the ball has a mass of 0.5 kg? 6. A 59 kg boy and a 42 kg girl are playing tug-of-war with a rope. If the girl accelerates towards the boy at a rate of 2.5 m/s?, find the acceleration of the boy towards the girl. (Hint: think about Newton's 3 law) 7. Ifa 22 kg bag is lifted with a force of 250 N, what is its rate of acceleration? 8. For each situation tell whether the weight of the object would seem to increase, decrease, or stay the same? a. You ride an elevator upwards at a constant speed. b. A boy is riding a free-fall drop ride at an amusement park. The ride drops from a high height and rapidly accelerates down towards the ground. c. Forthe same ride, at the end of the ride the brakes slow the boy before he reaches the ground