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THE VELOCITY OF A CAR INCREASES FROM 54 KM/PER HOUR TO 72KM/PER HOUR HOW MUCH WORK DONE IF MASS=1500 KG GIVE ANSWERS FIRST TO MARK IT BBRAINLIEST answer fasttt |
| Answer» INITIAL velocity (u) = 54×5/18= 15m/sFinal velocity (v) = 72×5/18= 20m/sMass of car (m) = 1500kgTo Find:-Work done (W).Solution:-As we KNOW that change of kinetic energy is called work done. so by USING the formula of kinetic energy .→Initial Kinetic Energy = 1/2mu²Substitute the value we get→ Initial Kinetic = 1/2×1500×15²→ Initial Kinetic = 750×225→ Initial Kinetic = 168750 JouleAnd Now Calculating the final kinetic energy→ Final kinetic = 1/2mv²Substitute the value we get→ Final kinetic = 1/2×1500×20²→ Final kinetic = 750×400→ Final Kinetic = 300000 JouleNow, Calculating Work doneWork done = Final Kinetic- Initial Kinetic→ W = 300000 - 168750→ W = 131250Joule∴ The work done is 131250 Joule. | |