# A car starts from a velocity at 10 m/s with an acceleration of 2.0 m/s^2. Find the time needed for the car to reach 20 m/s.

justaguide | College Teacher | (Level 2) Distinguished Educator

Posted on

The car starts from a velocity of 10 m/s with an acceleration of 2.0 m/s^2. The time required for the car to reach 20 m/s has to be determined.

For an object starting from a velocity u and which is accelerated at a rate a for a time t, the final velocity after t is given by v = u + a*t.

Substitute the values given in the equation. This gives

20 = 10 + 2*t

=> 2*t = 20 - 10

=> 2*t = 10

=> t = 5

The time needed for the car to reach a velocity of 20 m/s starting from 10 m/s and accelerated at 2 m/s^2 is 5 seconds.

zeeshankamal007 | Student, Grade 10 | (Level 1) Honors

Posted on

Since, the car starts at 10m/s

Therefore, u=10m/s

The final velocity is 20m/s

Therefore, v=20m/s

Since, v=u+at

Therefore, substituting the variable "t",we get,

v-u/a = t

Now, putting the values given, the time required is,

20m/s - 10m/s / 2 m/s^2 =5 Seconds..

Therefore, the time required is 5 seconds..

We’ve answered 317,950 questions. We can answer yours, too.