Question

2. A body moves with a velocity of
10 m/s for 10 s and then with a velocity of
20 m/s in the same direction for 40 s. Find its
average velocity
(Ans. 18 m/s)​

Answer 1

Answer:

18 m / sec

Explanation:

Given :

Velocity v₁ = 10 m / sec

Time t₁ = 10 sec

= > displacement = 10 × 10 = 100 m

Also velocity v₂ = 20 m / sec

Time t₂ = 40 sec

= > displacement = 20 × 40 = 800 m

Now :

V_avg. = ( 800 + 100 ) / ( 10 + 40 ) m / sec

= > V_avg. = 900 / 50 m / sec

= > V_avg. = 18 m / sec

Hence we get required answer!

Answer 2

_______________________________

Question :-

▪ A body moves with a velocity of

10 m/s for 10 s and then with a velocity of

20 m/s in the same direction for 40 s. Find its

average velocity.

_______________________________

Given :-

• Initial velocity of body (u) =10m/s.

• Time taken (t) =10s

• ∴ Distance (D) =10×10=100m.

• Final velocity (v) =20m/s

• Time taken (t')=40s

• ∴ Distance (D') =800m

To Find :-

• Average velocity

Solution :-

☛ Average velocity =Total displacement /Total time taken

☛ Av. Velocity =D+D'/t+t'

☛ Av. velocity =800+100/40+10

☛ Av. velocity =900/50

☛ Av. Velocity =18m/s

∴The average velocity of body is 18m/s.