Question #112947

A ball of mass 4 kg moves with a speed of 6 m/s. a) What is its momentum? b) What impulse is needed to stop it? c) What average force is needed to stop it in 3 s?

Expert's answer

(a) The momentum of a ball

"p_i=mv_i=(4\\:\\rm kg)\\times (6\\:\\rm m\/s)=24\\: kg\\cdot m\/s"(b) The impulse needed to stop a ball

(c) The average force needed to stop a ball

"F=\\frac{\\Delta p}{\\Delta t}=\\frac{24\\:\\rm kg\\cdot m\/s}{3\\:\\rm s}=8\\:\\rm N."
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