Physics, 07.04.2020 19:26 youngalien

A biker accelerates from Om/s to 8m/s ub 3 seconds. What is his acceleration? Is
this acceleration higher than that of a car wihich accelerates from 0 to 30m/s in
8 seconds

Answers: 2

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Answer from: editsa

The acceleration of the biker is 2.67m/s² while that of the car is 3.75m/s². So, the acceleration of the biker is NOT HIGHER than that of the car.

Explanation:

Given that,

acceleration of biker A= ?

Initial velocity of biker Vi = Om/s

Final velocity of biker Vf = 8m/s

Time taken (t) = 3 seconds

Since acceleration is the rate of change of velocity per unit time

i.e Acceleration = (Vf - Vi) / t

A = (8m/s - 0m/s) / 3s

A = 2.67 m/s²

To know which is higher, calculate the acceleration of the car

acceleration of car A= ?

Initial velocity of car Vi = Om/s

Final velocity of car Vf = 30m/s

Time taken (t) = 8 seconds

Acceleration = (30m/s - 0m/s) / 8s

A = 30m/s / 8s

A = 3.75 m/s²

Since, the acceleration of the biker is 2.67m/s² while that of the car is 3.75m/s², the acceleration of the biker is NOT HIGHER than that of the car.

Answer from: Quest

i believe the answer is a hope it and is correct

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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A biker accelerates from Om/s to 8m/s ub 3 seconds. What is his acceleration? Is
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