Question

please give right answer ​

Answer 1

Required Answer:-

For the above question, there is a relation between u, a, t and v because the acceleration is constant. This forms the first equation of motion i.e.

␥ $\boxed{ \rm{v = u + at}}$

So, let's just put those values and find the missing value listed above.

(1) v = u + at

➙ v = 2 + 4 × 3

➙ v = 2 + 12

➙ v = 14 m/s

(2) v = u + at

➙ 20 = u + 5 × 2

➙ 20 = u + 10

➙ u = 10 m/s

Note:-

• Know and derive the different equations ofmotion in both mathematical and graph method.
• Practice question to improve efficiency and gain confidence on the topic.

Answer 2

STEP-BY-STEP EXPLANATION:

.

In First Situation,

Here,

• The Initial velocity is 2m/s.

And,

• The Acceleration is 4m/s².

And,

• The Time taken is 3 second.

According To First Equation of Motion,

• The Rate of Velocity is Acceleration.
• ➤ (v - u) / t = a
• ➤ (v - 2m/s) / 3s = 4m/s²
• ➤ v - 2m/s = 4m/s² × 3s
• ➤ v - 2m/s = 12m/s
• ➤ v = 14m/s

In Second Situation,

Here,

• The Acceleration is 5m/s².

And,

• The Time taken is 2s.

And,

• The Final velocity is 20m/s.

First Equation of Motion,

• ➤ (v - u) / t = a
• ➤ (20m/s - u) / 2s = 5m/s²
• ➤ 20m/s - u = 5m/s² × 2s
• ➤ 20m/s - u = 10m/s
• ➤ 20m/s - 10m/s = u
• ➤ 10m/s = u

REQUIRED ANSWER,

• The Final velocity is 14m/s.
• The Initial velocity is 10m/s.