In a scientific test conducted in Arizona, a special cannon called HARP (High Altitude

It took the projectile 120 s to reach the maximum height.

Explanation:

Given;

maximum height of the projectile, s = 180 km = 180,000 m

initial speed of the projectile, u = 3 km/s = 3000 m/s

final velocity at maximum height, v = 0

Apply the following kinematic equation for average velocity of the projectile;

Therefore, it took the projectile 120 s to reach the maximum height.

Earth's magnetic field protects the planet's atmosphere from the solar wind, which consists of charged particles released by the sun's magnetic field. The interaction between the sun and Earth's magnetic fields sometimes cause storms of explosive nature in the space near Earth.

Explanation: