A car accelerates from rest at 2.9 m/s^2.
How much time does it need to attain a
speed of 4 m/s?
Answer in units of s.
are you supposed to divide 2.9 by 4?
how about 4 by 2.9 ...
so im supposed to divide 4 by 2.9?
yes
No, to find the time it takes for the car to attain a speed of 4 m/s, you need to use the equation of motion:
v = u + at
where:
v is the final velocity (4 m/s),
u is the initial velocity (0 m/s, since the car starts from rest),
a is the acceleration (2.9 m/s^2), and
t is the time taken.
To solve for t, rearrange the equation:
t = (v - u) / a
Substituting the given values:
t = (4 m/s - 0 m/s) / 2.9 m/s^2
t = 1.379 s
Therefore, the car will take approximately 1.379 seconds to attain a speed of 4 m/s.