Question

Determine the speed of a falling object 7.8 sec after it dropped.

a. 39 m/s
b. 304.2 m/s
c. 1.3 m/s
d. 78 m/s

Answer 1

76.4m/s

Step-by-step explanation:

Given parameter:

Time taken = 7.8sec

Unknown:

Speed after it dropped = ?

Solution:

To solve this problem, we use one of the kinematics equation:

V = U + gt

V is the final speed

U is the initial speed = 0m/s

g is the acceleration due to gravity

t is the time taken

V = 0 + 9.8 x 7.8 = 76.4m/s