Question

HEY MATES!!
PLEASE HELP ME OUT IN THIS QUESTION

A car changes its speed from 20km/h to 50km/h of mass 3600kg in 5s. Determine the net external force applied on the car is

THE BRAINLIEST ANSWER WILL BE SELECTED​✌

Answer 1

Answer:

NET EXTERNAL FORCE ( F ) = 6000 NEWTON

Explanation:

★ NEWTON'S LAWS OF MOTION ★

★ GIVEN ;

» Initial Velocity ( U ) = 20 km / h

[ 20 km / h = 20 × 5 / 18 = 50 / 9 (m / sec.) ]

» Final Velocity ( V ) = 50 km / h

[ 50 km / h = 50 × 5 / 18 = 125 / 9 (m / sec.) ]

» Mass of Car ( m ) = 3600 kg

» Change in Time ( ∆ t ) = 5 seconds

★ NET EXTERNAL FORCE ( F ) = ???

_______ [ BY USING FORMULA ] _______

$[Force \: (f) \: = \: \frac{ \: Change \: in \: Momentum \: ( \: p \: ) \:}{Time \: taken \: ( \: t \: )} = \: \frac{ \: Impulse \: }{Time} \:]$]

★ Force = ∆ p / ∆ t

= mv - mu / ∆ t

= m ( v - u ) / ∆ t

= 3600 [ ( 125 / 9 ) - ( 50 / 9 ) ] / ∆ t

= 3600 [ 75 / 9 ] / ∆ t

= 400 [ 75 ] / 5

= 400 [ 15 ]

= 6000 N

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★ FORCE ( F ) = 6000 NEWTON

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