Question

I drop a ball from rest , it falls for 7 sec. What speed did the ball reach

Answer 1

-68.6m/s

Step-by-step explanation:

after 1 second its velocity is -9.8 m/s. after 2 seconds its velocity is -19.6 m/s. after 3 seconds its velocity is -29.4 m/s.

so 7 multiplied by the velocity for 1 second will give you the answer.