While skateboarding at 19 km/h, Alana throws a tennis ball at 11 km/h to her friend Oliver. If Alana is the reference frame, the

Question

3 years ago

6

speed of the tennis ball is
(Blank)
km/h.

2 answers:

nirvana33 [79] · Answer 1 · 2022-07-15T18:26:00+03:00

7 0

Haven't taken physics but I would assume if her friend is standing in front of her that you would add up the speeds and get 30 km/hr.

mariarad [96] · Answer 2 · 2022-07-15T20:50:04+03:00

4 0

Answer : Speed of tennis ball is 30 km/h.

Explanation :

Alana's speed on the skateboard is 19 km/h

She throws a tennis ball at 11 km/h

Alana is throwing a ball towards her friend Oliver.

That means the velocity of Alana and ball gets added up.

So, Speed of tennis ball is $v_t=19\ km/h+11\ km/h=30\ km/h$