4. Cristiano Ronaldo, a 95 kg soccer player, is running at 4m/s. a) How fast doe

Question

4. Cristiano Ronaldo, a 95 kg soccer player, is running at 4m/s.

a) How fast does Neymar, an 80 kg soccer player, need to run to have the same momentum as Ronaldo? ____________________________

b) How fast does Jeroen Verhoeven, 120 kg player, need to run to have the same momentum as Ronaldo? ____________________________

c) All three players are race from center field to the goal line. Assuming they all have the same momentum and are leaving from the same initial position, who would reach the goal line first? ( ) Cristiano Ronaldo (95kg) ( ) Neymar (80kg) ( ) Verhoeven (120kg) Why? ________________________________________

Explanation / Answer

m = 95 kg, v = 4 m/s

a) m1 = 80 kg, v1 = ?

mv = m1*v1 =======> 95*4 = 80*v1 ========> v1 = 4.75 m/s

b) m2 = 120 kg, v2 = ?

mv = m2v2 =======> 95*4 = 120*v2 ======> v2 = 3.17 m/s

c) Neymar (80kg)

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