Question

1.
A body is moving with an initial velocity of 5 m/sec accelerates at 1 m/s. Its velocity after 5 sec
will be
(A) 20 m/s
(B) 10 m/s
(C) 5 m/s
(D) zero​

Answer 1

Given :-

Initial velocity of the body = 5 m/s

Acceleration of the body = 1 m/s

Time taken by the body = 5 sec

To Find :-

The final velocity of the body after 5 seconds.

Analysis :-

Here we are given with the initial velocity, acceleration and time taken by the body.

Substitute the given values from the question using the first equation of motion and find the acceleration of the body accordingly.

Solution :-

We know that,

• u = Initial velocity
• t = Time
• a = Acceleration
• v = Final velocity

Using the formula,

$\underline{\boxed{\sf First \ equation \ of \ motion=v=u+at}}$

Given that,

Initial velocity (u) = 5 m/s

Acceleration (a) = 1 m/s

Time taken (t) = 5 sec

Substituting their values,

⇒ v = 5 + (1 × 5)

⇒ v = 5 + 5

⇒ v = 10 m/s

Therefore, the velocity of the body after 5 seconds is 10 m/s.

Answer 2

Answer:

Given :-

• A body is moving with an initial velocity of 5 m/s accelerates at 1 m/s² and its time is 5 seconds.

To Find :-

• What is the final velocity after 5 seconds.

Formula Used :-

❖ v = u + at ❖

where,

• v = Final velocity
• u = Initial velocity
• a = Acceleration
• t = Time

Solution :-

Given :

• Initial velocity = 5 m/s
• Acceleration = 1 m/s²
• Time = 5 seconds

According to the question by using the formula we get,

⇒ v = 5 + 1 × 5

⇒ v = 5 + 5

➠ v = 10 m/s

∴ The final velocity after 5 seconds is 10 m/s .