Question

The speed of car (mass 2000 kg) increases from 54 km/hr to 72 km/hr. What is the change in Momentum?

Answer 1

$\huge\underline {\sf {Answer:}}$

$\underline {\bold {Given:}}$

• $u = 54 \ km/h = 15 \ m/s$
• $v = 72 \ km/h = 20 \ m/s$

$\underline {\bold {Find:}}$

• $Change \ in \ momentum$

$\underline {\bold {Solution:}}$

⠀⠀$\implies Initial \ momentum = mu$

⠀⠀$\implies Final \ momentum = mv$

$Change \ in \ momentum = mv - mu$

⠀⠀$\implies m(v-u)$

⠀⠀$\implies 2000(20-15)$

⠀⠀$\implies 2000 \times 5$

⠀⠀$\implies 10000 \ kgm/s$

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