Question

The question is below in the details section. its too big to be up here. adding a question mark as per regulations-?

A body of mass .40 kg moving initially with a constant speed of 10 m/s to the north is subjected to a constant force of 8 N directed towards the south for 30 seconds. Take the instant the force is applied to be t=0, the position of the body x=0.predict its position at t= -5 seconds

Answer 1

If I am reading the question correctly, much of the information in the question is spurious, and it is a simple uniform motion question.

Explanation:

If the force starts at time `t=0`, and the question is what was the position at `t=-5`, then everything that happens after that is irrelevant.

So if the question really is "predict the position at t=-5s, then the only information we need is "moving initially with a constant speed of 10 m/s to the north".

If the body moves 10 m [North] each second, then 5s before t=0, the body would be -50m [North] or 50m [South] of the position at `t_0`.