Physics, 23.10.2020 19:20 Arealbot

A rock is thrown horizontally from a 65 meter high cliff with an initial velocity of 8 m/s. What is the vertical component of the velocity of the rock when it hits the ground?

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Answer from: kari9249

Projectile motion is a combination of horizontal and vertical motion. - The horizontal ... What are the horizontal and vertical components of the initial velocity? Round your ... A rock is thrown horizontally at a speed of 5.0 m/s from the top of a cliff 64.7 m high. The rock hits the ground 18.0 m from the base of the cliff.

Explanation:

Answer from: Quest

we need to know the time interval during which the force acts. impulse of force = momentum change

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 rock is thrown horizontally from a 65 meter high cliff with an initial velocity of 8 m/s. What is...

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