Question

Calculate the kinetic energy of a car of mass 400kg moving with a velocity of 36 m/sec. Find the kinetic energy if the velocity of car becomes three times? ​

Answer 1

Answer:

Explanation: m= 400kg

                      v= 36m/s

                      K.E.= $1/2mv^2$

                            =1/2×400×$(36)^2$

                           =1/2×400×36×36 (2 and 36 will get cancelled )

                           = 400×18×36

                          =259200 J

    WHEN VELOCITY BECOMES THRICE,

                   m=400kg

                      v= 3v

                           3×36m/s =108m/s

                     K.E.= $1/2mv^2$

                           =1/2×400×108×108 (108 and 2 will get cancelled)

                          =400×108×54

                        =2332800 J

    hope it helps... Happy to help you...