Stop The goal ,You idiot!!

Classical Mechanics Level 1

A 150 g ball travelling at a speed of 30 m/s strikes the palm of the goalkeeper's Hands and is stopped in 0.05 Seconds. Find the force applied by the goalkeeper.

D e t a i l s a n d A s s u m p t i o n s Details and Assumptions

Enter your answer as a number i.e. Without the unit (which here is newtons)


The answer is 90.

Mehul Arora by Mehul Arora , 20, India

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2 solutions

Abyoso Hapsoro
Apr 3, 2015

Known: 1. mass/m = 150 g = 0.15 kg 2. velocity/v = 30 m/s 3. time/t = 0.05 s Asked: Force/F? Answer: F = m . a F\quad =\quad m\quad .\quad a F = m . v t F\quad =\quad m\quad .\quad \frac { v }{ t } F = 0.15 . 30 0.05 F\quad =\quad 0.15\quad .\quad \frac { 30 }{ 0.05 } F = 3 . 30 = 90 N F\quad =\quad 3\quad .\quad 30\quad =\quad 90\quad N

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Yash Khatri
Dec 28, 2014

We know F=ma = m(v-u)/t

Therefore, Ft= m(v-u)

By substituting the values, we get, F=0.15x30/0.05

F=90N

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