Question

at a certain instant and auto driver is driving at a speed of 30 kilometre per hour then uniformly accelerates the auto after 2.5 minutes the speed of auto become 60 km per hour what is the average speed of the auto what is the value of uniform acceleration during the interval of time​

Answer 1

Answer:uniform acceleration =0.2 m/sec2

Average speed= 7.5km/hr

Explanation:

Acceleration =v-u/time

Acceleration =

60-30/2.5min

Convert 2.5min into sec

1min=60sec

2.5min=?sec

Cross multiplication

2.5*60sec =150sec

Acceleration =

60-30/150=30/150=1/5

=0.2m/sec2

Average speed= total distance/2

1st find distance

S=d/t

30km/hr=d/150sec

Convert 150sec or 2.5min

Into hour

60 min = 1hr

2.5min=?hr

hr=2.5/60

D1=30*2.5/60=12.5km

D2=60*2.5/60=2.5km

Average speed= d1+d2/2

=12.5+2.5/2

=15/2

=7.5km/hr