A 1.10kg block is attached to a spring with spring constant 18 N/m. While the block is sitting at rest, a student hits it with a hammer and almost instantaneously gives it a speed of 40cm/s .What is the block's speed at the point where x = 0.45 A?

The velocity is  

Explanation:

From the question we are told that

   The  mass is  

   The  spring constant is  

   The  speed is

    The  position considered is  x =  0.45 A  

Here A is the amplitude which is mathematically represented as

=>    

=>    

So    

=>    

Generally the speed at  x  is mathematically represented as

=>    

=>    

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.