Paper 4 May/June 2011 MATHEMATICS (9709/43) A Levels
لطفا برای اطمینان از عملکرد و تجربه بهتر از مرورگرهای مدرن و به روز مانند کروم یا فایرفاکس استفاده کنید.

A load is pulled along horizontal ground for a distance of $76{\text{ }}m$, using a rope. The rope is inclined at ${5^ \circ }$ above the horizontal and the tension in the rope is $65{\text{ }}N$.
a) Find the work done by the tension.
At an instant during the motion the velocity of the load is $1.5m{\text{ }}{s^{ - 1}}$.
b) Find the rate of working of the tension at this instant.