Paper 5 May/June 2010 MATHEMATICS (9709/51) 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 a horizontal straight track, from $A$ to $B$, by a force of magnitude $P{\text{ }}N$ which acts at an angle of ${30^ \circ }$ upwards from the horizontal. The distance $AB$ is $80{\text{ }}m$. The speed of the load is constant and equal to $1.2{\text{ }}m{\text{ }}{s^{ - 1}}$ as it moves from $A$ to the mid-point $M$ of $AB$.
a) For the motion from $A$ to $M$ the value of $P$ is $25$. Calculate the work done by the force as the load moves from…