- #1

uk9999

- 11

- 0

## Homework Statement

Two bodies A and B collide in a totally inelastic collision. Using the relevant equations and given that the mass of body A is 1200kg and the collision lasts for 0.2s, determine the average force vectors acting on each body during the collision.

## Homework Equations

v

_{A}=5i+3j m/s

v

_{B}=-i+4j m/s

m

_{A}=(3/2)m

_{B}

Common velocity after collision v=2.6i+3.4j m/s

## The Attempt at a Solution

__attempt 1__

Ft = (m

_{A}+m

_{B})v - (m

_{A}v

_{A}+m

_{B}v

_{B})

calculation checked and rechecked... leads to wrong answer

__attempt 2__

Ft = (m

_{A}+m

_{B})v - (m

_{A}v

_{A}-m

_{B}v

_{B})

calculation checked and rechecked... leads to wrong answer

__attempt 3__

F

_{A}t=0.5(m

_{A}+m

_{B})v - m

_{A}v

_{A}

F

_{B}t=0.5(m

_{A}+m

_{B})v - m

_{B}v

_{B}

calculation checked and rechecked... leads to wrong answer

**Answer is stated as "F**

_{A}= -F_{B}= (-14400i+2400j) N in the mark scheme