Question

A student is walking along the hallway at 1m/s when the bell rings for class. The student reaches their classes their classroom door in 10 seconds ,now moving at 3m/s. How much did they accelerate

Answer 1

final speed of the students when they reached at door of the classroom will be

$v_f = 3 m/s$

initially all are moving at speed

$v_i = 1 m/s$

it took t = 10 s to reach to the classroom

now as per definition of acceleration we will have

$a = \frac{v_f - v_i}{t}$

now plug in all values in it

$a = \frac{3 - 1}{10}$

$a = \frac{2}{10}$

$a = 0.2 m/s^2$

so here student will accelerate at rate of 0.2 m/s^2