7. The Cuyahoga River in Ohio has caught fire eleven times. The last time was in 1969, when
sparks from a train are believed to have ignited
an oil slick on the river. The condition of the
Cuyahoga River most likely helped persuade
Congress to pass which act?
A. the Wilderness Act
B. the Clean Water Act
C. the Flood Control and Coastal Emergency
Act
D. the Marine Protection, Research, and
Sanctuaries Act

4

explanation:

4

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19