A man of mass 85kg, on a bicycle of mass 15kg, coasts down a slope inclined at 4.5* to the horizontal, at a constant speed of 4.7m/s.
a)what is the force of friction on the man and his bicycle?
b)if the man wanted to ride up the same slope at the same speed, what force would he have to exert...
a uniform ladder of mass 12kg is 4.6m long. if it is lifted from a horizontal to a vertical position, how much work is done
i just thought because i have to lift the centre of the mass, i'd have to do mgh with h being 2.3m. I think i am sure that i don't have the right answer. Sniff.. help...