Ten seconds after starting from rest,a freely falling object will have a speed of about______ rn/s

A: 10
B: 50
C: 100
D: 120
I know that the answer A is not correct.

vf=g*time

Vf= vi +at

vf= (0) +(-10)(10)
vf=-100m/s downward

To determine the speed of a freely falling object, we can use the equation:

v = gt

Where:
v = speed (m/s)
g = acceleration due to gravity (9.8 m/s^2)
t = time (s)

Since the object starts from rest, its initial speed (u) is 0. After 10 seconds, the speed (v) can be calculated by substituting the given values into the equation:

v = gt
v = 9.8 m/s^2 * 10 s
v = 98 m/s

Therefore, the correct answer is C: 100 m/s.

To solve this question, we can use the formula for the speed of a freely falling object. The speed of a freely falling object after t seconds can be calculated using the equation:

velocity = acceleration × time

In this case, the acceleration due to gravity is the only force acting on the object, and it has a value of approximately 9.8 m/s². Therefore, we can substitute the values into the equation to find the answer.

Let's calculate the speed of the object after 10 seconds:

velocity = 9.8 m/s² × 10 s

velocity = 98 m/s

Since the question asks for the speed in rn/s (presumably meters per second), we can conclude that the correct answer is 98 m/s.

Therefore, the correct option is not given among the choices (A, B, C, or D).