Question

An electron has a constant acceleration of 3.2 m/s2. At a certain instant its velocity is 9,6m/s.
What is its velocity 2.5 sec earlier?
A)
1.4 m/s
B)
1.6 m/s
C)
2.4 m/s
D)
3.2 m/s​

Answer 1

Answer:

1.6 m/s velocity, V=9.6m/s

Acceleration, a=3.2m/s

The final velocity of particle is given by:VF=Vote+at

in this case since we want to now the velocity at an earlier time we set , the given velocity and we solve

9.6=Vo+(3.2)(2.5)

Vo=9.6-(3.2)(2.5) =1.6m/s