Question

An object is thrown vertically upward at 27.1 m/s. The velocity of the object 3.4 seconds later is ____ m/s. Round your answer to the nearest tenth. Do not use scientific notation. Take up as positive and down as negative.

Answer 1

Answer:

-6.2 m/s (downward)

Explanation:

The velocity of an object thrown vertically upward is given by:

$v= u + at$

where:

u is the initial velocity

a = g = -9.8 m/s^2 is the acceleration due to gravity

t is the time

In this problem,

u = 27.1 m/s

t = 3.4 s

So, the velocity after 3.4 s is

$v=27.1 m/s + (-9.8 m/s^2)(3.4 s)=-6.2 m/s$

and the negative sign means the velocity points downward.