Please help. A weight is pulled up with a spring such that the spring force is equal to 35N and the weight accelerates upwards at 3m/s^2 solve for the mass of the weight

Explain using examples, what is simple harmonic motion and why it is an important area of study in physics.

Ball bearings are made by letting spherical drops of molten metal fall inside a talll tower-called a shot tower- and solidify as they fall. a-if a bearing needs 4.0 s to solidify enough for impact, how high must the tower be? b- what is the bearing's impact velocity?

Pls ! what are 3 examples of acceleration that doesn’t involve a change in speed ?