i need help in writing newton second law lab. we did three experiment, first we constant mass, then acceleration and then force. i did in laboratory correctly please help me. We use car on track and have 200g weight hanger and 250g of two blocks on car.

Supposedly you were trying to prove that F = m a, since you called is a "Newtons's Second Law" lab. Without a better idea of what you did and what you were trying to prove, I can't be of any further assistance