1) A motor car of mass 1200kg is moving along a straight line with a u

1.	1) A motor car of mass 1200kg is moving along a straight line with a uniform velocity of90km/hr. Its velocity is slowed down to 18km/hr in 4s by an unbalanced external force.Calculate the acceleration and change in momentum. Also calculate the force required.
Answer» U first need to convert km/hr into m/s by multiply it with 5/18 therefore....v=25m/s .... u = 5m/s 1).... v = u + at 25 = 5 + a(4) 20 = 4a a = 5 m/s square 2)...... CHANGE in momentum... P = m(v-u) = 1200(25-5) =1200(20) = 24000 kgm/s 3) ......F = ma = 1200*5 = 6000 N.....

1) A motor car of mass 1200kg is moving along a straight line with a uniform velocity of90km/hr. Its velocity is slowed down to 18km/hr in 4s by an unbalanced external force.Calculate the acceleration and change in momentum. Also calculate the force required.

Answer»

U first need to convert km/hr into m/s by multiply it with 5/18

therefore....v=25m/s

.... u = 5m/s

1).... v = u + at

25 = 5 + a(4)

20 = 4a

a = 5 m/s square

2)...... CHANGE in momentum...

P = m(v-u)

= 1200(25-5)

=1200(20)

= 24000 kgm/s

3) ......F = ma

= 1200*5

= 6000 N.....

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1) A motor car of mass 1200kg is moving along a straight line with a uniform velocity of90km/hr. Its velocity is slowed down to 18km/hr in 4s by an unbalanced external force.Calculate the acceleration and change in momentum. Also calculate the force required.

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