Question

3. If a girl runs around a circular track of length 400m and comes back to
the initial point in 40s, what would be her speed and velocity.
7 point
O speed 25m/s,velocity 10
O speed 29m/s, velocity o
speed 10m/s, velocity 0
O speed 10m/s, velocity 10​

Answer 1

$\small\sf\red{Given:→}$

➳ Length of circular path = 400m

➳ Girl comes to the initial position after 40s.

$\small\sf\orange{To\:Find→}$

• Speed
• Velocity

$\small\sf\pink{Concept\:used:→}$

➨ Speed is defined as the ratio of total distance travelled to the total time taken.

➨ Velocity is defined as the ratio of displacement to the time.

➨ Distance is defined as the actual length of path which is covered by moving body (scalar).

➨ Displacement is defined as the shortest distance b/w initial and final position of entire journey (vector).

$\small\sf\green{calculation→}$

➱speed of Girl :

⇒ Speed = Distace/time

⇒ Speed = 400/40

⇒ Speed = 10m/s✓

➱Velocity of Girl :

⟶ Here, Displacement of girl will be zero because she comes to the initial position after the given interval of time.

➢ Velocity = Displacement/time

➢ Velocity = 0/40

➢ Velocity = 0 m/s✓

Answer 2

$\small\sf\blue{Given:→}$

➳ Length of circular path = 400m

➳ Girl comes to the initial position after 40s.

$\small\sf\orange{To\:Find→}$

•Speed

•Velocity

$\small\sf\pink{Concept\:used:→}$

➨ Speed is defined as the ratio of total distance travelled to the total time taken.

➨ Velocity is defined as the ratio of displacement to the time.

➨ Distance is defined as the actual length of path which is covered by moving body (scalar).

➨ Displacement is defined as the shortest distance b/w initial and final position of entire journey (vector).

$\small\sf\green{calculation→}$

➱speed of Girl :

⇒ Speed = Distace/time

⇒ Speed = 400/40

⇒ Speed = 10m/s✓

➱Velocity of Girl :

⟶ Here, Displacement of girl will be zero because she comes to the initial position after the given interval of time.

➢ Velocity = Displacement/time

➢ Velocity = 0/40

➢ Velocity = 0 m/s

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♥️♥️$\huge\purple{Hope\:It\:Helps!!}$♥️♥️