Question

A car starting from rest attains a velocity of 20 metre per second in 5 second find acceleration ​

Answer 1

Answer:

4 metre per seconds

Explanation:

Answer 2

Answer:

• Acceleration is 4 m/s².

Given:

• Initial velocity = 0 m/s [It starts from rest]
• Final velocity = 20 m/s
• Time taken = 5 sec

Explanation:

$\rule{300}{1.5}$

From first kinematic equation we know,

$\longrightarrow{\sf{v\ =\ u\ +\ at}}$

Here,

• v denotes final velocity
• u denotes initial velocity
• a denotes acceleration
• t denotes time taken

Substitute the values,

$\longrightarrow{\sf{20\ =\ 0\ +\ a \times 5}} \\ \\ \\ \longrightarrow{\sf{20\ =\ 0\ +\ 5a}} \\ \\ \\ \longrightarrow{\sf{\dfrac{20}{5}\ =\ a}} \\ \\ \\ \longrightarrow{\sf{4\ =\ a}} \\ \\ \\ \longrightarrow{\sf{a\ =\ 4\ m/s^2}}$

∴ The acceleration of the car is 4 m/s².

$\rule{300}{1.5}$