Question

.A box falls to the ground from a delivery truck traveling at 30 m/s. After hitting the road, it slides 45 m to

rest. How long does it take the box to come to rest

Answer 1

t = 3 seconds

Step-by-step explanation:

Given that,

Initial speed, u = 30 m/s

Final speed, v = 0

It slides 45 m to rest.it take the box to come to rest

We need to find how long it take the box to come to rest.

Let a be the acceleration and t is time.

`v^2-u^2=2ad\\\\a=(v^2-u^2)/(2d)\\\\a=((30)^2-u^2)/(2(45))\\\\=10\ m/s^2`

Now finding time.

`t=(v-u)/(a)\\\\t=(30-0)/(10)\\\\t=3\ s`

So, the required time is 3 seconds.