Question

37. A car travels along a straight line for first half time with a velocity 20 km/h and the second half time with a velocity of 30 km/h. Calculate the average speed of the car.​

Answer 1

Answer:

The average speed of the car = 50 km/hr. The car travels straight path for first half time and second half time. The average speed for the travel journey is calculated over total distance travelled and total time for the travel. Given, speed1 = 40 km/hr and speed 2 = 60 km/hr.

Answer 2

For first half, distance s

1

=

2

v

1

t

=

2

80t

For the next half, distance s

2

=

2

v

2

t

=

2

40t

Average speed =

2

t

+

2

t

2

80t

+

2

40t

=60kmh

−1

Hence, average speed is 60kmh

−1

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