Physics, 17.03.2022 01:00 michaelortega5808

1. You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30 m/s. The ball has energy. Calculate it.

Answers: 3

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Answer from: paolaviviana

kinetic

945 J

Explanation:

The ball has kinetic energy.

KE = 1/2mv²

= 1/2 x 2.1 x 30 x 30

= 450 x 2.1

= 945 J

Answer from: chhimmidemg

Kinetic energy = 1/2(MV²)

Given:
Mass = 2.1kg
Velocity = 30m/s

Substitute:
K.E = 1/2(2.1 x 30²)
K.E = 1/2( 2.1 x 900)
K.E = 2.1 x 450
K.E = 945 joules

Answer from: Quest

Caredbajshjn i belgajsbajbabasbbaba

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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1. You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30 m/s. T...