Question

A car, moving with an initial velocity of 10 m/s, has a constant acceleration of 4 m/s2. After 5 seconds, find (c) the average velocity in m/s.

Answer 1

Answer:

u

Explanation:

u = 10m/s

a = 4 m/S2

t = 5s

using Newton's equition of motion

v= u + at

v = 10+4*5

= 10+20 = 30m/s

Answer 2

Answer:-

To Find: Average velocity of the particle.

Given:-

• Initial velocity (u) = 10 m/s
• Acceleration (a) = 4 m/s²
• Time taken (t) = 5 s

We know,

• a = (v - u)/t
• Avg. velocity = (v + u)/2

Finding final velocity:-

(v - 10 m/s)/(5 s) = 4 m/s²

→ 5[v/5 - 2 m/s]/(5 s) = 4 m/s²

→ v/5 - 2 m/s = 4 m/s

→ v/5 = 4 m/s + 2 m/s

→ v/5 = 6 m/s

→ v = (6 m/s)(5)

→ v = 30 m/s

NOW, average velocity:-

(v + u)/2

= (30 m/s + 10 m/s)/2

= (40 m/s)/2

= 20 m/s ...(Answer)