Question

pls say these answer today is my test​

Answer 1

Explanation:

3) speed is a scaler quantity because

speed = distance/ time.

there is no direction that's why speed is a scaler quantity.

scalar

contains only distance

vector

contains distance and magnitude, magnitude is nothing but direction

Answer 2

↪ Scalar Quantity: Any physical quantity which require only magnitude for its complete description is called scalar quantity.

Question: Speed is a scalar quantity. Why?

• Speed is a scalar quantity as it has only magnitude but not direction. Hence speed is a scalar quantity.

Question: A bus starts from rest and gains a velocity of 20m/s after 4 seconds. Find it's acceleration.

• u = 0
• v = 20m/s
• t = 4s
• a = ?

a = v-u/t

a = 20-0/4

a = 20/4

a = 5m/s^2