Atennis ball is dropped from 1.20 m above the ground. it rebounds to a height of 1.00 m. (a) with what velocity does it hit the ground?

The velocity at which it hits the ground is 4.8497 .

Given:

Height of the ball = 1.2 meter

To find:

The velocity does it hit the ground = ?

Formula used:

Where v = final velocity of the ball

u = initial velocity of the ball

a = acceleration due to gravity = 9.8

s = distance travelled by the ball = 1.2 meter

Solution:

A tennis ball is dropped from 1.20 m above the ground.

According to kinematic equation of motion,

Where v = final velocity of the ball

u = initial velocity of the ball = 0

a = acceleration due to gravity = 9.8

s = distance travelled by the ball = 1.2 meter

Thus,

= 0 + 2 × 9.8 × 1.2

= 23.52

v = 4.8497

Hence, the velocity at which it hits the ground is 4.8497 .

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force