Soccer !

a football with a mass 2 kg is in a state of idle, then a football players kick the ball with a force 50 N so the velocity of the ball become 5 m/s. how far (in meters) the soccer ball go?


The answer is 0.5.

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5 solutions

Jung Hyun Ran
May 19, 2014

We know: F = m a F=ma a = F m a=\frac{F}{m}

And: v 2 v 0 2 = 2 a s v^{2}-v_{0}^{2} = 2as

Thus, v 2 = 2 F m s s = v 2 m 2 F v^{2} = 2\frac{F}{m}s → s=\frac{v^{2}m}{2F}

So, The soccer ball travel s = 5 2 × 2 2 × 50 = 0.5 s=\frac{5^{2}\times2}{2\times 50} = 0.5 m

Satyam Pandey
Mar 27, 2014

given that F=50n,M=2kg v=5m/s S=? as it was stationary U=O WE KNOW f=ma therfor A=F/M=50/2 =25 WE KNOW (V^2-U^2)/2A =S,, 5^2/2into25 =0.5m

I did the same thing!

kowshik dey - 7 years, 2 months ago
Shakil Hossain
Mar 19, 2014

given that, F=50n, m=2kg V=5m/s AND S=? as ball was stationary so , u=0m/s WE know, F=ma a=f/m=50/2=25 t=(v-u)/a=(5-0)/25=1/5 S=ut+.5at^2=0+.5 25 1/.25 =.5m

Asif Iqbal
Mar 9, 2014

d=0.5

Andi M
Mar 8, 2014

W = E k W = \triangle Ek

F x s = 1 2 × m × ( V t 2 V 0 2 ) F x s = \frac{1}{2} \times m \times (V_t^{2} - V_0^{2})

50 s = 1 2 × 2 × ( 5 2 0 2 ) 50s = \frac{1}{2} \times 2 \times (5^{2} - 0^{2})

s = 1 × 25 50 = 0.5 s = \frac{1\times 25}{50} = 0.5

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