a object of mass 4 kg is dropped from a height 20m. it reaches the ground with a speed of 16m/sec .Work done on the body by air friction

a object of mass 4 kg is dropped from a height 20m. it reaches the gro

1.	a object of mass 4 kg is dropped from a height 20m. it reaches the ground with a speed of 16m/sec .Work done on the body by air friction
Answer» 卄乇ㄚ千尺丨乇几ⅅ 卄乇尺乇丨丂ㄚㄖ凵尺卂几丂山乇尺 =================================== ⊙ Mass = 4kg ⊙ h (s) = 20m ⊙ U = 0 m/sec ⊙ V = 16m /sec Using the 3rd equation of MOTION...... $v {}^{2} = u {}^{2} + 2as \\ \\ 256 = 40a$ $a = \frac{256}{40} = 6.4$ so, a = 6.4 m/s^2. Now , $f = ma \\ \\ f = 4 \times 6.4 = 25.6n$ Now , $w = fs \\ \\ w = 25.6 \times 20 = 512joules$ so, WORKDONE is 512 joules. Hope it helps you $prabhudutt$

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a object of mass 4 kg is dropped from a height 20m. it reaches the ground with a speed of 16m/sec .Work done on the body by air friction

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