Question

What is the acceleration of a ball traveling horizontally with an initial velocity of 20 meters/second and, 2.0 seconds later, a velocity of 30 meters/second? A. 1.6 meters/second2 B. 3.0 meters/second2 C. 3.4 meters/second2 D. 5.0 meters/second2 Reset Next

Answer 1

Centripetal acceleration is 47 m/s²

Step-by-step explanation:

It is given that,

Radius of the circle, r = 1.8 meters

The velocity of the ball, v = 9.2 m/s

We have to find the centripetal force of a ball on a string that is whirled horizontally over a boy’s head. It is given by :

So, the centripetal acceleration of the ball on a string is 47 m/s². Hence, the correct option is (E).

Answer 2

Answer: Acceleration of the ball in the given system is 5 meter per Second Square

The laws of motion are used to determine various aspects of an object in motion.

Step-by-step explanation:

Applying the first law of motion to calculate acceleration; if formula used in first law is given as
`v=u+at`

Here we have a final velocity as 40 meter per second and initial velocity as 20 meter per second and time span is given as 2 second applying the given values in the given equation and finding the value of a

`30=20+a * 2 = a=5 m/s^2`