Question

An object is moving east, and its velocity changes from 65 m/s to 25 m/s in 10 seconds. Which describes the acceleration? 4 m/s2 in negative acceleration 4 m/s2 in positive acceleration 9 m/s2 in positive acceleration 9 m/s2 in negative acceleration

Answer 1

vf-vi/time negative accn 4m/sec^2

Answer 2

$4\ m/s^2$ in negative direction.

Explanation:

Given that,

Initial speed, u = 65 m/s

Final speed, v = 25 m/s

Time, t = 10 s

We know that the rate of change of velocity is called acceleration of an object. It is given by :

$a=\dfrac{v-u}{t}\\\\a=\dfrac{(25-65)\ m/s}{10\ s}\\\\a=-4\ m/s^2$

So, the acceleration of the object is $-4\ m/s^2$. Hence, the correct option is $4\ m/s^2$ in negative direction.

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