Question

Problem 7.04 A 100-kg tackler moving at a speed of 2.9 m/s meets head-on (and holds on to) an 82-kg halfback moving at a speed of 5.0 m/s. Part A What will be their mutual speed immediately after the collision? Express your answer to two significant figures and include the appropriate units. MÅ R o 2 ? W' = Value

Answer 1

Applying conservation of momentum, Total momentum before collision = Total momentum after collision Total momentum before collision = (82 x 5) - (100 x 2.9) = 120 kgm/s Total momentum after collision = (82 + 100)' = 1820' → 1820' = 120 = 120 v' = 100 = 0.66 m/s