Question

What is the declaration of a vehicle moving in a straight line that changes its velocity from 100kmhr to a dead stop in 10 sec ?

Answer 1

Answer:

-10 km/hr per second.

Explanation:

as,

initial velocity : 100 km/hr

final velocity : 0 km/hr

time of deasceleration : 10 sec

now,

u-v

u-v ----------

u-v ---------- t

0-100/10

-100/10

-10. answer

Answer 2

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Deceleration of the vehicle will be -25/9 m/s²

Explanation:

Given that,

Initial velocity = u = 100km/hr = 500/18 m/s

Final velocity = v = 0 km/hr = 0m/s

Time taken = 10s

We know that,

Acceleration = Change in velocity/Time

a = (v - u)/t

a = (0 - 500/18)/10

a = -500/180 = -50/18

a = -25/9 m/s²