When did slavery start in American

1930
1620
1776
1850

slavery first began in 1776

Explanation:

Slavery existed in the United States from its founding in 1776 until the passage of the Thirteenth Amendment in 1865. Slavery lasted in about half of U.S. states until 1865. As an economic system, slavery was largely replaced by sharecropping and convict leasing.

hope it's helpful

we can solve this via the kinematic equation:

where the vertical velocity is zero and so:

since the height of the building is 29.3 meters then:

the ball was in motion for approximately 2.45 seconds

they can increase to boost the enonomy.