Question

A car is speeding up and has an instantaneous velocity of 1.00 m/s in the +x-direction when a stopwatch reads 10.0 s. It has a constant acceleration of 2.60 m/s2 in the +x-direction. What is the speed when the stopwatch reads 12.0 s?

Answer 1

Initial velocity,

Acceleration,

Time interval,

So, final velocity,

              

                  

                  

Direction of final velocity is in the +x direction.

So, the speed of the car is 6.2 m/s when the stopwatch reads 12 s.