Question

what work is said to be done to increase the velocity of a car from 15 km per hour to 30 km per hour if the mass of the car is 1000 kg

Answer 1

i forgot it i will give you answer tomorrow

Answer 2

$\\ \\ u = 15km/h \: or \: \frac {25}{6} m/s \\ \\ v = 30km/h \: or \: \frac {50}{6} m/s \\ \\ K.E_{i} = \frac {1}{2} \times 1000 \times \frac {625}{36} \\ \\ K.E_{i} =\frac {312500}{36} \: J \\ \\ K.E_{f} = \frac {1}{2} \times 1000 \times \frac {2500}{36} \\ \\ K.E_{f} = \frac {1250000}{36} \: J \\ \\ W = \delta K.E \\ \\ W = \frac {1250000}{36} - \frac {312500}{36} \\ \\ W = \frac {1250000 - 312500}{36} \\ \\ W = 156250\:Joules$