Question

A speeding car changes its velocity from 108 kmph to 36 kmph in 4 seconds. The acceleration in m/s² is *

Answer 1

Answer:

-5 m/s² is the deceleration produced.

Explanation:

Given :

Initial velocity (u) = 108 Km/h

Final velocity (v) = 36 Km/h

Time taken (t) = 4 seconds

To find :-

Acceleration (a)

Solution :-

Acceleration = Change in velocity/Time taken

u = 108 Km/h

• 108 × 5/18
• 30 m/s

v = 36 Km/h

• 10 m/s

Acceleration = (v - u)/t

• (10 - 30)/4
• (-20)/4
• -5

∴ The body is decelerating and the deceleration is -5 m/s².