Question

A 0.2-kg ball is bounced against a wall. It hits the wall with a speed of 20 m/s and rebounds elastically. What is the magnitude of the change in momentum of the ball?

Answer 1

@UnkleRhaukus

Answer 2

4 kg m/s

Answer 3

so in an elastic collision , what happens to the energy?

Answer 4

M=mv

Answer 5

use p for momentum

Answer 6

It hits at an angle or horizontally ?

Answer 7

\[p_i=mv_i\]
\[p_f=mv_f\]

\[v_f=-v_i\]

Answer 8

lol the collision is elastic so no kinetic energy is lost.. hence speed will be same

Answer 9

magnitude of momentum will also be same then

Answer 10

even if the ball comes in at an angle the momentum will have the same magnitude after collision, (assuming elastic collision)

Answer 11

So what is the answer

Answer 12

4 kg m/s

Answer 13

So i was right :D

Answer 14

YaY!!

Answer 15

Since the earth is attracted to the sun, why doesn't it fall into the sun?

Answer 16

distance is so huge that force is veeeeeeeeeeerrrrrry less

Answer 17

Because it has too much mass to move towards the sun.

Answer 18

Because it has too much inertia to move toward the sun.

Answer 19

ahm ahm rep up

Answer 20

@lgbasallote

Answer 21

@vikrantg4

Answer 22

what ?

Answer 23

Because it has too much inertia to move toward the sun.
^^ THIS IS THE RIGHT REASON I GUESS

Answer 24

sure

Answer 25

lol yeah @hba