Question

what is the work done to change the velocity of an object from 76km/h and 36km/h if it's made is 1500kg Dose the work done is negative or positive.​

Answer 1

Step-by-step explanation:

Initial Velocity u = 76 Km/hr = 21.1 m/s

Final Velocity v = 36 Km/hr = 10 m/s

Mass m = 1500 Kg

According to Work Energy Theorem,

Work done = Change in KE

= 1/2 m (v²- u²)

= 0.5 (1500)(100- 445.21)

= (750)(- 345.21)

= - 258907.5 Joule Answer