Physics, 29.10.2019 13:31 hamzaha

Acar traveling 95 km/h strikes a tree. the front end of the car compresses and the driver comes to rest after traveling 0.80 m . part a what was the magnitude of the average acceleration of the driver during the collision?

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Answer from: carlo123

Assuming the acceleration is constant, then we can use the derived equations for rectilinear motion. The equation is written below:

2ax = v²- v₀²
where
a is the acceleration
x is the distance
v is the final velocity
v₀ is the initial velocity

Since the car came to a stop, v = 0. Substituting the values,
2a(0.80 m) =0² - [(95 km/h)(1000 m/1 km)(1 h/3600 s)]²
Solving for a,
a = -435.23 m/s²
The sign is negative because it is decelerating.

Answer from: Almonte87

The magnitude of the average acceleration of the driver during the collision is about 440 m/s²

Further explanation

Acceleration is rate of change of velocity.

$\large {\boxed {a = \frac{v - u}{t} } }$

$\large {\boxed {d = \frac{v + u}{2}~t } }$

a = acceleration ( m/s² )

v = final velocity ( m/s )

u = initial velocity ( m/s )

t = time taken ( s )

d = distance ( m )

Let us now tackle the problem !

This problem is about Kinematics.

We will solve it in the following way.

Given:

initial velocity of the car = u = 95 km/h = (475/18) m/s

distance = d = 0.80 m

final velocity of the car = v = 0 m/s

Unknown:

acceleration = a = ?

Solution:

v^2 = u^2 + 2ad

0^2 = (475/18)^2 + 2a(0.80)

$a = -(475/18)^2 \div 1.6$

$a \approx -440 ~ m/s^2$

Learn moreVelocity of Runner : linkKinetic Energy : linkAcceleration : linkThe Speed of Car : linkAnswer details

Grade: High School

Subject: Physics

Chapter: Kinematics

Keywords: Velocity , Driver , Car , Deceleration , Acceleration , Obstacle , Speed , Time , Rate , Tree

Acar traveling 95 km/h strikes a tree. the front end of the car compresses and the driver comes to r

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Answer from: Quest

The displacement is the change in position. final position minus the initial position.the initial position at the origin is 0 m. the final position is -12 m. therefore the displacement of the object is -12 m.

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