Paper 4 October/November 2009 MATHEMATICS (9709/41) A Levels
لطفا برای اطمینان از عملکرد و تجربه بهتر از مرورگرهای مدرن و به روز مانند کروم یا فایرفاکس استفاده کنید.

One end of a light inextensible string is attached to a block. The string is used to pull the block along a horizontal surface with a speed of $2{\text{ }}m{\text{ }}{s^{ - 1}}$. The string makes an angle of ${20^ \circ }$ with the horizontal and the tension in the string is $25{\text{ }}N$. Find the work done by the tension in a period of 8 seconds.