Question

To the nearest tenth of a second, how much time would it take the penny to hit the

ground?

A. 0.5 seconds
B. 0.6 seconds
C. 0.7 seconds
D. 0.8 seconds

Answer 1

B. 0.6 seconds

Because they want you to round to the nearest 10th and 0 is the ground.

Answer 2

Option B. 0.6 seconds

Explanation:

As given in the table at time t = 0 the maximum height of the penny is 2 meters.

In simpler way we can say the penny has been throw from a height of 2 meters.

Now this process can be represented by the equation of motion

`h=ut+(1)/(2)gt^(2)`

For free fall u = 0

So
`h=(1)/(2)gt^(2)`

where h = 2 meters

and g = 9.81 m/sec²

By putting these values in the equation

`2=(1)/(2)(9.81)(t)^(2)=4.905t^(2)`

`t^(2)=(2)/(4.905)=0.4077`

t = √0.4077 = 0.6385 seconds

or t = 0.6 seconds

Answer is option B. 0.6 seconds