39 G ?4GE.d 39% 8:21 PM What is the average force exerted by the ball on the wal

Question

39 G ?4GE.d 39% 8:21 PM What is the average force exerted by the ball on the wall? Correct, computer gets: 1.24E+00 N 9. [1pt] Suppose m is a certain mass and v is;a certain speed v>0. A mass m_1- 9m moving to the right with a velocity v 1 +9v collides head-on with a second mass m 2 - 4m moving to the left with a velocity v-2--4v. The two masses stick together to form a single mass moving with velocity v f- n v, where n is a number (no units). What is n? Answer 10.[1pt] A 144kg astronaut (including space suit) acquires a speed of 2.42m/s by pushin off with her legs from an 1920Kg space capsule. What is the change in speed of the space capsule?

Explanation / Answer

inital momentum (of ) = +9m*9v - 4m*4v = 81mv-16mv = 65mv

new mass = 9m+3m = 13m

as per conservation of momentum, new velocity = 65mv/13m = + 5 v

hence n = 5

again applying conservation of linear momentum, 144kg*2.42m/s + 1920kg*(xm/s) = 0

hence x = - 144*2.42/1920 = - 0.1815 m/s

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