Physics, asked by shanuvarshney071, 1 month ago

6.A motorcar of mass 1000kg is moving along a straight line with a uniform velocity (3) of 70km/h. Its velocity is slowed down to 20km/h in 6 s by an unbalanced external force. Calculate the acceleration and change in momentum. Also calculate the magnitude of force required.​

Answers

Answered by naiya74
0

Explanation:

Given : Mass of the motorcar, M=1200kg

Initial velocity of the car, u=90 km/h=25 m/s (∵1km/h=

18

5

m/s)

Final velocity of the car, v=18 km/h=5 m/s

Time taken t=4 s

ΔP=mv−mu

ΔP=1200×5−1200×25=−24000 kg m/s

v=u+at

5=25+a×4

⟹a=−5 m/s

2

(-ve shows retardation)

∣F∣=m∣a∣=1200×5=6000 N

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