Question

a body is moving with a speed of 72 kmph its velocity is brought to 54 kmph in 10 sec. find the retardation​ pls fast with explanation

Answer 1

Given:-

• Initial velocity (u) = 72km/h =72×5/18 =20m/s

• Final velocity (v) = 54km/h = 54×5/18=15m/s

• Time (t) = 10s

To Find:-

• Retardation (a)

Solution:-

As we know that negative acceleration is called retardation.

By using 1st equation of motion

→ v = u+at

Substitute the value we get

→ 15 = 20 + a×10

→ 15-20 = a×10

→ -5 = a×10

→ a = -5/10

→ a = -0.5m/s²

∴ The retardation of the body is 0.5m/s².