A) julie is running to the right at 5 m/s, as shown in the 1st figure. balls 1 and 2 are thrown toward her at 10 m/s by friends standing on the ground. according to anita, what's the speed of the two balls? b) julie is running to the right at 5 m/s, as shown in the 2nd figure. balls 1 and 2 are thrown toward her by friends standing on the ground. according to julie, both balls are approaching her at 10 m/s. according to julie's friends, what's the speed of the two balls? give explanations and step-to-step solution and calculus. you!

Part 1)

here Julie is running at speed 5 m/s

So here two balls are thrown at speed 10 m/s towards Julie with respect to her friend standing on the ground.

So here this all speed is real speed of all.

Now as per Anita (let say she is one of her friend standing on ground) the speed of two balls will be same as the given speed as she is observing from ground or stationary frame

As per the frame of Julie

speed of ball 1

towards her in same side

speed of ball 2

towards her from opposite side

Part b)

Now in this case the speed of two balls is given with respect to Julie

so we can say

for ball 1

so in ground frame speed of ball 1 is

Similarly for ball 2

So speed in ground frame of ball 2 is

so its 5 m/s from opposite side

frequency or wavelenth of em radiation in a vacuum

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft