Q.3: (a) Jack was posted to a remote region in the deep-space To monitor the space-Traffic, at the end of his duty-hour a 'spaceship' passed by quickly. The 'Iaser rangefinder' displayed that the 'spaceship' was 85 m long. But The 'ID- tronsponder' showed that indeed this was \"000777 croft" That has its standard length of 100 m. What was the actual speed of the 'spaceship' that Jack would report to the command center? (b) If 1.0 gram sand mass is destroyed in some classified nuclear- reaction process and converted into electrical energy with 40% efficiency, Calculate how long it would run a 5~KW Engine That runs a factory