7. A 0.250 kg block oscillates on a spring horizontally on a frictionless surface. The spring has a spring constant of 200 N/m. The amplitude of the oscillations is 24.5 cm. What is the period of this mass-spring system (in seconds)? а. b. What is the maximum speed of the block (in m/s)?

4. Bodies A and B are moving in the same direction in a straight line with a constant velocities on a frictionless surface. The mass and the velocity of A are 2kg and +10 m/s. The mass and the velocity of B are 6kg and 4 m/s. A spring is connected to the back of the body B who's spring constant is 800 N/m. What would the maximum compression of the spring be? A 10 m/s B 4 m/s 2 kg 6 kg

1. A 1.2 kg block and a 2.8 kg block are initially at rest on a massless platform supported by a spring with a spring constant of 45 N/m.a. What is the compression of the spring with the two masses resting on it? b. If the 2.8 kg block is suddenly removed, what is the initial acceleration of the 1.2 kg block at the moment the 2.8 kg block is removed? Hint: draw a FBD of the 1.2 kg block.c. What maximum height above the platform does the 1.2 kg block reach?

A 5.0 kg object is placed on top of a vertical spring. Eventually the object comes to rest 10 cm below its starting point. The mass is then pushed down until the spring is compressed by 30 cm in total. It is then released. a. What maximum height, above the uncompressed spring, does the mass reach? b. What is the speed of the object when it leaves the spring? c. What is the maximum speed that the object reaches? d. What is the maximum acceleration of the object? Answer in 2 significant digits (or 3)