Question

2. (a) A body is moving along a circular track covering its one complete round of 120 m in 10 s.
What is the average speed?
(b) A body covers 20 m in first second, 25 m in second and 45 m in the third second. What is the average speed ​

Answer 1

Let the total distance be 2x.

For first half distance :

Speed is 20 m/s

Thus time taken t

1

=

20

x

For second half distance :

Speed is 30 m/s

Thus time taken t

2

=

30

x

Average velocity V

avg

=

t

1

+t

2

2x

⟹ V

avg

=

20

x

+

30

x

2x

=

20+30

2×20×30

=24 m/s

Explanation:

Ok

Answer 2

Answer:

(a) 12m/s

Explanation:

Distance covered-120m

Time taken - 10s

so, speed = distance/ time=120/10= 12m/s