Question

A cabbie is trying to stop when he notices a fare is whistling them over. The

car has 18750 J of energy. If the cab is 2100. kg, how fast was it moving?

Answer 1

• K.E=18750J
• Mass=m=2100kg
• Velocity=v

`\boxed{\sf K.E=(1)/(2)mv^2}`

`\\ \sf\longmapsto 18750=(1)/(2)2100v^2`

`\\ \sf\longmapsto 18750=1050v^2`

`\\ \sf\longmapsto v^2=(18750)/(1050)`

`\\ \sf\longmapsto v^2=17.85m^2`

`\\ \sf\longmapsto v=√(17.85)`

`\\ \sf\longmapsto v=4.1m/s`