Question

a ball is launched upward from the ground at 30.0 m/s. its location at 1 - second intervals is shown. determine the time, velocity, and acceleration at the four indicated locations. enter negative values for any downward - directed vector.

color - coding key:
not checked correct incorrect erasing answer

Explanation:

Step1: Identify the kinematic - equation

We use the equation $v = v_0+at$, where $v_0 = 30.0$ m/s, $a=- 10$ m/s².

Step2: Calculate velocity at E

For location E with $t = 4$s, substitute into the equation $v = v_0+at$. So $v=30+( - 10)\times4$.
$v=30 - 40=-10$ m/s.

Answer:

-10