Question

An object is projected horizontally at 400 meters per second. If the object falls freely to the ground in 2.0 seconds, at what height did it begin its fall?

Answer 1

The object began its fall from a height of 19.6 meters.

Step-by-step explanation:

The height from which the object began its fall can be calculated using the formula for free fall motion. Since the object falls freely, it only experiences vertical motion. We can use the equation:

h = 1/2 * g * t^2

where h is the height, g is the acceleration due to gravity (9.8 m/s^2), and t is the time of fall. Plugging in the values, we have:

h = 1/2 * 9.8 * (2)^2 = 19.6 meters

Therefore, the object began its fall from a height of 19.6 meters.