Ty for your response and hints to part 3. I've worked out part 3 using the speed-time graph (which I guess the question was hinting at) and it's quite simple, which fits in with a small part 3 question in an M1 book.
I used area=half base times height. Solving for the top side gives 40s; the...
Homework Statement
A Lift in a mine shaft takes exactly one minute to descend 500m. It starts from rest , accelerates uniformly for 12.5 seconds to a constant speed which it maintains for some time and then decelerates uniformly to stop at the bottom of the shaft.
The mass of the lift is 5...
[SOLVED] Gravitation Problem
Homework Statement
The moon has a mass of 7.7times10^22kg and radius 1.7times10^6m. Calculate:
a) The gravitational potential at its surface.
b) The work needed to completely remove a 1.5times10^3kg spacecraft from its surface into outer space.
c) What is the...