Question

A motor car of mass 1200 kg is moving along a straight line with a uniform velocity of 90 km per hour its velocity is slow down to 18 kilometre per hour in 4 seconds by an unbalanced external force calculate the acceleration and change in momentum

Answer 1

Answer:

Here is your answer:

Explanation:

given:

u = 90 km/hr

  = 25 m/s

v = 18 km/hr

  = 5 m/s

m = 1200 kg

t = 4 s

By using the first law of motion, we get:

v = u + at

5 = 25 + a(4)

4a = 5 - 25

a =  - 20/ 4

∴ a = -5 m/s²

P = mv

P = 1200(5)

P = 6000 kg m/s

∴ a = -5 m/s² and P = 6000 kg m/s

Hope this helps you !

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