Question

select the correct answer from each drop - down menu. a ball starts from rest. it rolls down a ramp and reaches the ground after 4 seconds. its final velocity when it reaches the ground is 7.0 meters/second. the initial velocity of the ball is meters/second, and its acceleration is meters/second².

Explanation:

Step1: Identify initial velocity

The ball starts from rest, so the initial velocity $u = 0$ m/s.

Step2: Use the equation $v=u + at$

We know $v = 7.0$ m/s, $u = 0$ m/s and $t = 4$ s. Rearranging the equation $v=u + at$ for $a$ gives $a=\frac{v - u}{t}$.
Substitute the values: $a=\frac{7.0 - 0}{4}=\frac{7}{4}=1.75$ m/s².

Answer:

The initial velocity of the ball is 0 meters/second, and its acceleration is 1.75 meters/second².