Question

2.
A boy covers a distance of 260 m in
20 s and another distance of 300 m
in 20 s. The average speed of the boy
is :
A)
14 ms
B) 28 ms
C) 42 ms
D) 56 ms!​

Answer 1

Answer:

In first distance average speed is 13 m/sec

In second distance average speed is 15 m/sec

Together the average speed is 13+15= 28 m/sec

Answer 2

Answer:

Explanation:

Given :

• A boy covers a distance of 260 m in 20 s.

Here,

D1 = 260 m

T1 = 20 s

• Another distance of 300 m in 20 s.

Here,

D2 = 300 m

T2 = 20 s

To Find :

• The average speed of the boy.

Solution :

Apply average speed formula,

$\tt \green{Average \: speed = \dfrac{total \: distance \: travelled}{total \: time \: taken} }$

Now,

$\tt \longrightarrow \: Average \: speed = \dfrac{D_1 + D_2}{T_1 + T_2} \\ \\ \tt \longrightarrow \: Average \: speed = \dfrac{260 + 300}{20 + 20} \\ \\ \tt \longrightarrow \: Average \: speed = \dfrac{560}{40} \\ \\ \tt \longrightarrow \red{ Average \: speed = 14 \: ms {}^{ - 1} }$

Hence :

The average speed of the boy is 14 m/s.