Question

Bob drops a ping pong ball (m = 0.01 kg) and Mike at the same time and at the same height drops a bowling ball (m = 12 kg), which ball hits the ground first if both are considered in free fall? Ping pong ball They both hit at the same time Bowling ball No answer text provided. Question 13 1 pts Cathy drops a ball, if we approximate the acceleration due to gravity to be g = 10 m/s/s, how fast is the ball going after 2 s? If Cathy takes a second ball and throws it straight up in the air with an initial velocity of 30 m/s, how fast is the ball moving after 2 s? v down - 10 m/s and v up - 20 m/s v down - 20 m/s and v up - 10 m/s v down - 10 m/s and vup - O m/s v down - 20 m/s and v up - 50 m/s v down - 20 m/s and vup - 20 m/s

Answer 1

1)we know that the time taken to hit the ground does not depend on the mass of object in free fall. Hence the correct option is:

They both hit at the same time.

2)for First ball:

v_down=u+gt=0+(10*2)

v_down=20m/s

for second ball:

v_up=u-gt=30-(10*2)

v_up=10m/s