A 25 N force stretches a spring 0.280 m. What was the spring constant?

Using the given data table, calculate the acceleration of the skateboarder. you can use either form of the equation below?

Aferris wheel is a vertical, circular amusement ride with radius 9 m. riders sit on seats that swivel to remain horizontal. the ferris wheel rotates at a constant rate, going around once in 9 s. consider a rider whose mass is 56 kg. at the bottom of the ride, what is the perpendicular component of the rate of change of the rider's momentum? at the bottom of the ride, what is the vector force exerted by the seat on the rider?

Which best represents the law of conservation of mass ?