Question

a body starts from rest covers a distance of 20 m in 10 seconds what is the acceleration of the body ​

Answer 1

Answer:

0.4 m/s2

Explanation:

this is by the formula s=ut+1/2at2

Answer 2

Given :

Initial velocity = 20m

Time interval = 10s

To Find :

Acceleration of the body.

Solution :

❒ Acceleration is defined as the rate of change of velocity.

• It is a vector quantity having both magnitude as well as direction.
• It can be positive, negative or zero.
• SI unit : m/s
• Dimension formula : [L¹T‾¹]

Formula : $\underline{\boxed{\bf{\purple{a=\dfrac{v-u}{t}}}}}$

♦ Second equation of kinematics :

• d = ut + 1/2 at²

» d denotes distance

» u denotes initial velocity

» t denotes time

» a denotes acceleration

By substituting the given values;

➙ d = ut + 1/2 at²

➙ 20 = (0)(10) + 1/2 a (10)²

➙ 20 = 100a/2

➙ 20 = 50a

➙ a = 20/50

➙ a = 0.4 m/s²