Aspring with spring constant 15 n/m hangs from the ceiling. a ball is attached to the spring and allowed to come to rest. it is then pulled down 7.5 cm and released. the ball makes 31 oscillations in 15 s seconds.

1) what is its the mass of the ball?
express your answer using two significant figures.
m = g

2) what is its maximum speed?
express your answer using two significant figures.

= cm/s

What is the magnitude of the resultant vector round your answer to the nearest tenth

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?

What is the kinetic energy of a baseball moving at a speed of 40 m/s if the baseball has mass of 0.15 kg?