# physics

A car starts from rest and travels for 5.3 s with a uniform acceleration of +1.2 m/s2. The driver then applies the brakes, causing a uniform acceleration of -2.3 m/s2. The breaks are applied for 1.60 s.

How fast is the car going at the end of the braking period?

How far has the car gone from its start?

1. 👍 0
2. 👎 0
3. 👁 129
1. d1 = 0.5a*t^2 = 0.6*5.3^2 = 16.85 m.
V1 = a*t = 1.2m/s^2 * 5.3s = 6.36 m/s.

a. V = Vo + a.t
V = 6.36m/s - 2.3m/s^2*1.60s = 2.68 m/s.

b. V^2 = V0^2 + 2a*d
d2 = V^2-Vo^2)/2a
d2 = (2.68^2-6.36^2)/-4.6 = 7.23 m.

D = d1 + d2 = 16.85 + 7.23 = 24.1 m.

1. 👍 0
2. 👎 0
posted by Henry

## Similar Questions

1. ### physics

A car starts from rest and travels for 6.0 s with a uniform acceleration of +1.2 m/s2. The driver then applies the brakes, causing a uniform acceleration of -1.8 m/s2. The breaks are applied for 1.70 s. (a) How fast is the car

asked by Shaina on September 4, 2012
2. ### physics

A car starts from rest and travels for 5.3 s with a uniform acceleration of +1.2 m/s2. The driver then applies the brakes, causing a uniform acceleration of -2.3 m/s2. The breaks are applied for 1.60 s. How fast is the car going

asked by jahlen on September 4, 2013
3. ### Physics

A car starts from rest and travels for 5.9 s with a uniform acceleration of +1.3 m/s2. The driver then applies the brakes, causing a uniform acceleration of -1.7 m/s2. The breaks are applied for 1.60 s. (a) How fast is the car

asked by Anonymous on November 12, 2014
4. ### physics

A car starts from rest and travels for 4.9 s with a uniform acceleration of +1.8 m/s2. The driver then applies the brakes, causing a uniform acceleration of -1.7 m/s2. The breaks are applied for 1.50 s. 1) How fast is the car

asked by Taylor on September 6, 2010
5. ### Physics

A car starts from rest and travels for 5.4 s with a uniform acceleration of +1.6 m/s 2 . The driver then applies the brakes, causing a uniform acceleration of -2.2 m/s 2 . The breaks are applied for 1.80 s. (a) How fast is the car

asked by Dakota on September 3, 2012
6. ### physics

A car starts from rest and travels for 5.2 s with a uniform acceleration of +1.8 m/s2. The driver then applies the brakes, causing a uniform acceleration of -2.0 m/s2. The breaks are applied for 2.00 s. (a) How fast is the car

asked by helen on September 4, 2012
7. ### physics

A car starts from rest and travels for 7.0 s with a uniform acceleration of +3.0 m/s2. The driver then applies the brakes, causing a uniform acceleration of −2.5 m/s2. If the brakes are applied for 2.0 s, determine each of the

asked by lol on August 29, 2018
8. ### physics

A car starts from rest and travels for 6.0 s with a uniform acceleration of +2.4 m/s2. The driver then applies the brakes, causing a uniform acceleration of −1.0 m/s2. If the brakes are applied for 3.0 s, determine each of the

asked by sally on February 3, 2012
9. ### physics

A car starts from rest and travels for 6.0s with a uniform acceleration of 2.7m/s ^2. The driver then applies the brakes, causing a uniform acceleration of -2.0m/s^2. If the brakes are applied for 2.0s, determine each of the

asked by george on February 4, 2013
10. ### Physics

A car starts from rest and travels for 5.9 s with a uniform acceleration of +1.2 m/s2. The driver then applies the brakes, causing a uniform acceleration of -1.7 m/s2. The breaks are applied for 1.70 s.

asked by Penelope on September 2, 2013

More Similar Questions