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A car travelling at 72 km per hour takes a U- turn in 10 sec Find the acceleration?
Wiki User
∙ 15y ago
Assuming the car starts out travelling in one direction at 72mph and 10 seconds later is travelling at 72mph in the oposite direction then we can calculate the average acceleration. First lets reduce the question to SI units. 1mph = 0.44704 m/s so 72mph = 32.187 m/s Since Velocity is a vector quantity (includes direction) the car starts out with a velocity of 32.187 m/s and ends with a velocity of -32.187 m/s. The change in velocity is therfore 64.374 m/s. Acceleration = change in velocity / time taken for change The change is 67.374 over 10 = 6.7373m/s/s. Of course this is only the average acceleration. In reality the acceleration is probably different throughout most of the 10s but we don't have enough information in the question to work out what it is at any given moment. All we are given is the starting and ending conditions and the time between them so we can only calcualate the average over this time.
Wiki User
∙ 15y ago
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