Question

12. A body moves along straight path and travels two consecutive equal distance in different
interval of time with speed 20 m/s and 30 m/s. The average speed of body is.
1) 30 m/s
2) zero
3) 35 m/s
4) 24 m/s




say the answer fast ​

Answer 1

Explanation:

ANSWER

Let the total distance travelled by the body is 2s.If t

1

is the time taken by the body to travel first half of the distance ,then

t

1

=

2

S

Let t

2

be the time taken by the body for each time interval for the remaining hal journey.

S=3t

2

+5t

2

=8t

2

So, average speed =

totaltimetaken

totaldistancetravelled

=

t

1

+2t

2

2S

=

2

S

+

4

S

2S

=

3

8

ms

−1