Question

travelling at a speed of 100 kilometres per hour in 1 hour and increase its speed to 120 kilometre per hour in next 1 hour . find the average speed in km/h and m/s​

Answer 1

Answer:

Average speed = 105 km/h or 29.167 m/s

Step-by-step explanation:

First, the object traveled 1 hr with speed 100 km/h

Distance travelled = 100 * 1 = 100km

Time taken = 1 hr

Now, the object accelerated to 120 km/h within 1 hr. Therefore,

Acceleration (a) = (120-100)/1 = 20 km / h/ h

Distance travelled during this acceleration,

d = u*t + a*t*t/2

d = 100*1 + 20*1*1/2

d = 100 + 10

d = 110 km

Time taken = 1 hr

Finally,

Total Distance Traveled = 100 + 110 = 210 km

Total Time Taken = 1 + 1 = 2 hr

Hence, Average speed = 210/2 = 105 km/h

In m/s,

= 105000/(3600)

= 29.167 m/s