Ask Question
17 November, 21:00

A motor car of mass 1200kg is moving along a straight line with uniform velocity of 90km/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 external force acting on it.

+3
Answers (1)
  1. 17 November, 21:28
    0
    Initial velocity (u) = 90km/hr = 90/3.6 m/s = 25m/s

    final velocity (v) = 18km/hr = 18/3.6 m/s = 5m/s

    acceleration = (v-u) / t = (5-25) / 4 = - 5 m/s2

    change in momentum = m (v-u) = 1200 (5-25) = - 24000 kg•m/s

    F = ma = 1200 x - 5 = - 6000 N
Know the Answer?
Not Sure About the Answer?
Find an answer to your question 👍 “A motor car of mass 1200kg is moving along a straight line with uniform velocity of 90km/hr. Its velocity is slowed down to 18km/hr in 4s ...” in 📗 Physics if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers