Posted by **Simeon** on Tuesday, March 23, 2010 at 5:18am.

1. A car starts from rest and accelerates at a constant rate to 80km/h in 6s in positive direction. What is the acceleration?

2. After how long will the car speed be 120km/h if it keep accelerating at the same rate as in 1.?

3.After the car reached speed of 120km/h it travels at constant velocity for next 100. What distance does it cover in that 100s?

- Physics for life science -
**drwls**, Tuesday, March 23, 2010 at 5:31am
1. 80 km/h = 22.22 m/s

Divide that by 6s for the acceleration

a = 3.70 m/s^2

2. If the speed reaches 80 km/h in 6 s and the acceleration stays the same, it will reach 120 km/h in 1.5 x 6 = 9 seconds.

3. 120 km/h = 33.33 m/s

Multiply that by 100s for the answer, in meters.

Or, you can multiply 120 km/h by 100/3600 hours, for the distance in km.

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