Three identical balls are thrown from the same height off a tall building. They are all thrown with the same speed, but in different directions. Ball A is thrown in the horizontally, parallel to the roof; ball B is thrown at an angle 45° above the horizontal; ball C is thrown at an angle 45° below the horizontal. Which ball has the greatest speed just before it hits the ground? Assume that the ground near the building is level, and ignore any effects due to air resistance.

three balls have the same speed

Explanation:

In a parabolic motion we have that

but the time just before the balls hit the ground is

Hence we have

ball A

ball B

ball C

Hence, all three balls have the same speed just before hit the groug

vA=vB=vC

I hope this is useful for you

regards

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.