Question

The odometer of a car reads 2500 km at the start of a trip and 3000 km at the end of the trip. If the trip took 8h, calculate the average speed in SI unit

Answer 1

Answer:

Explanation:  the odometer measures the distance travelled

the distance travelled before the trip  =  2500 km

the distance travelled after the trip  =     3000  km

so the distance travelled in the trip  =  3000 km  -  2500 km

                                                         =    500km  

                                                         =    500  × 1000 metre

                                                         =     500000 metre

now the time taken to travel this distance  =  8 hours  

                                                             =  8   × 3600 seconds

                                                             =   28800 seconds

now average speed  =    distance travelled in the trip ÷ time taken to travel this distance  

=              500000 metre/28800 seconds   ≈   17.3  metre per second