I need help with this question below ASAP! Calculate the net force and the acceleration acting on the mass. (pls download the image to understand the question)

Thank you in advance

In which of the following cases is work being done on an object? question 2 options: pushing against a locked door carrying a box down a corridor pulling a trailer up a hill suspending a heavy weight with a strong chain

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.

1.what is where an object is located 2. what is how fast an objects speed is changing 3. what is how fast an object is moving