Question

An airplane increases its speed at the average rate of 15 m/s2. How much time does it take to increase its speed from 100 m/s to 160 m/s

Answer 1

4 s

Step-by-step explanation:

• Acceleration (a) = 15 m/s²
• Initial velocity (u) = 100 m/s
• Final velocity (v) = 160 m/s

We are asked to calculate time taken (t).

By using the first equation of motion,

`\longrightarrow` v = u + at

`\longrightarrow` 160 = 100 + 15t

`\longrightarrow` 160 - 100 = 15t

`\longrightarrow` 60 = 15t

`\longrightarrow` 60 ÷ 15 = t

`\longrightarrow` 4 s = t