Sometimes when the speed of vehicle increased, its body start to bounc

1.	Sometimes when the speed of vehicle increased, its body start to bounce why?
Answer» <html><body><p></p><a href="https://interviewquestions.tuteehub.com/tag/solution-25781" style="font-weight:bold;" target="_blank" title="Click to know more about SOLUTION">SOLUTION</a> :Natural frequency of vehicle and frequency of vehicle <a href="https://interviewquestions.tuteehub.com/tag/due-433472" style="font-weight:bold;" target="_blank" title="Click to know more about DUE">DUE</a> to rough road becomes <a href="https://interviewquestions.tuteehub.com/tag/equal-446400" style="font-weight:bold;" target="_blank" title="Click to know more about EQUAL">EQUAL</a> then rosonance occurs and <a href="https://interviewquestions.tuteehub.com/tag/hence-484344" style="font-weight:bold;" target="_blank" title="Click to know more about HENCE">HENCE</a> the amplitude becomes large, So <a href="https://interviewquestions.tuteehub.com/tag/vehicles-1444476" style="font-weight:bold;" target="_blank" title="Click to know more about VEHICLES">VEHICLES</a> bounces.</body></html>

Sometimes when the speed of vehicle increased, its body start to bounce why?