Question

An object in free fall moves 10 m/sec after 1 sec, and 20 m/sec after 2 sec. Its speed after 5 sec will be

50 m/sec.
30 m/sec.
45 m/sec.
70 m/sec.

Answer 1

The speed of the object in free fall after 5 seconds will be 49 m/s.

Step-by-step explanation:

The speed of an object in free fall can be determined using the equation v = u + gt, where v is the final velocity, u is the initial velocity, g is the acceleration due to gravity, and t is the time. In this case, the object's initial velocity is 0 m/s and the acceleration due to gravity is approximately 9.8 m/s². Plugging in the values, we can calculate the final velocity after 5 seconds:

v = 0 + (9.8 * 5) = 49 m/s

Therefore, the object's speed after 5 seconds will be 49 m/s.