GK
PHYSICS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
A ball is thrown downward from the top of a roof with a speed of 25 m/s. After 2 s, its velocity will be:(Choose upward as positive)
|
|
19.6 m/s
|
|
|
-5.4 m/s
|
|
|
-44.6 m/s
|
|
|
44.6 m/s
|
Explanation:
Detailed explanation-1: -Every second, the velocity decreases by 9.8 until the velocity reaches zero.
Detailed explanation-2: -Thus the acceleration in the ball is negative which means that the value of g is to used here with the neagtive sign. Thus, the intial velocity of the ball is 19.6 m/s which means that the ball has been thrown upwards with a velocity of 19.6 m/s . Thus the ball takes 2 seconds to reach the highest point of the ground .
There is 1 question to complete.