Question

an object is moving up an inclined plane . its velocity changes from 15 m/s to 10 m/s in two seconds.what is its acceleration?

Answer 1

Task. An object is moving up an inclined plane. Its velocity changes from $v_{0}=15$ m/s to $v_{1}=10$ m/s in $t=2$ seconds. What is its acceleration?

Solution. Assume that the plane moved with constant acceleration $a$. Then $a$ can be expressed via $v_{0}$, $v_{1}$ and $t$ by the following formula:

$a=\frac{v_{1}-v_{0}}{t}.$

Substituting values we get:

$a=\frac{v_{1}-v_{0}}{t}=\frac{10-15}{2}=-2.5\ m/s^{2}.$

The negative sign means that the velocity decreases during the motion.

Answer. $a=2.5\ m/s^{2}$.