At one instant a heavy object in air is moving upward at 50 meters per second.One second later its speed is approximately
A)40 m/s.
B)50 m/s.
C)55 m/s.
D)60 m/s.

Question

Quizplus · Accepted Answer

From the given question, we know that the object is moving upward at 50 meters per second at one instant. 
One second later, the object will experience a downward acceleration due to gravity, which is approximately 9.8 m/s^2. 
This means that after one second, the object's speed will decrease by 9.8 m/s. 
Therefore, the object's speed after one second will be:
50 - (9.8 x 1) = 40 m/s
Hence, the best choice is A) 40 m/s.

At One Instant a Heavy Object in Air Is Moving