Question

13.
In a journey, a car travels at the rate of 20 km/hr for 10 minutes and then at 30 km/hr
for 20 minutes. Find :
the total distance travelled by the car and
(ii)
the average speed of car during the journey.
14.
Displacement from the starting position of a body moving in one dimension is given
by:
S = (2X +5X2) m Calculate :
(i) Velocity of the body X = 0 m
(ii) Average velocity between X = 1m and X=5 m
Acceleration of the body.
Tell me question no. 13 & 14....​

Answer 1

Answer:

1.i)13.33km ii) 25km/hr

Answer 2

Answer:

given speed1=20km/hr

speed2=30km/hr

time1=10min

time2=20min

Now,

1. distance 1=speed 1*time1
2. distance1=20km/hr *10min
3. distance1=20km/hr*10/60 hr
4. distance1=10/3 km

Now,

1. distance2=speed2*time2
2. distance 2=30km/hr*20/60hr
3. distance 2=10km

total distance=distance1+distance2

total distance=10/3+10

total distance=40/3