# What is the KE of a 3kg toy car that moves at 4m s?

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## What is the KE of a 3kg toy car that moves at 4m s?

The acceleration of a given mass from rest to the velocity is known as kinetic energy. It gains energy from acceleration and remains in this state until the speed of the object changes. Given the mass m = 3 kg, v = 4 m / s. K.E = 24 J.

## What is the velocity of a rock that is 0.02 kg and has 36 J of Ke?

Expert-Verified Answer The mass of the rock is 0.02 kg and has 36 J of kinetic energy, then the velocity of the rock will be equal to 60 m/s.

## What’s the formula for kinetic energy?

Kinetic energy is directly proportional to the mass of the object and to the square of its velocity: K.E. = 1/2 m v2. If the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

## What is the KE of a 3kg ball that is rolling at 2m s?

KE= ½ m v2 = ½ (3kg) (2 m/s)2 = 6 Joules 8.

## What is the KE of a 1kg trolley Travelling at 2m s?

K E = 1 2 m v 2 = 1 2 ⋅ 1 k g ⋅ ( 2 m s ) 2 = 2 J .

## What is the speed of 2 kg ball having kinetic energy of 4 j?

The speed of the 2 k g ball having a kinetic energy of is 2 m s – 1 .

## What is the velocity of a body of mass 2kg moving in the xy plane?

Velocity of a body of mass 2 kg moving in x-y plane is given by v⃗ =(2i^+4tj^)m/s, where t is the time in second.

## What is the velocity of mass a of 2 kg?

Velocity of mass ‘A’ of 2kg is V(A)=(3hat i+2hat j) m/s and velocity … The velocity of a projectile at the initial point A is (2hat(i)+3hat(j… A partical of mass ‘m’ moving with a velocity (3 hat(i)+2hat(j))m//s c…

## What is the SI unit for velocity?

What is the SI unit of velocity? The SI unit of velocity is metres per second (m/s). Alternatively, the velocity magnitude can also be expressed in centimetres per second (cm/s).

## How do you find K in physics?

As a formula, it reworks Hooke’s Law and is expressed through the equation: k = – F/x. Where k is the spring constant, F is the force applied over x, and x is the displacement by the spring expressed in N/m.

## What is the SI unit of energy?

The SI unit of energy is same as that of work, which is joule (J).

## How do you calculate the KE of a car?

- Step 1, Given data. Mass of the car, m = 750 kg. Velocity, v =54 kmph =54×518 m/s=15 m/s. Mass of the passenger = 50 kg. Step 2, Finding the kinetic energy. We know that, Kinetic energy, KE=12mv2. …
- Step 2, Finding the kinetic energy. We know that, Kinetic energy, KE=12mv2. Putting all the values. K.E =12×750×15×15. =84375 J.

## How do you find the kinetic energy of a moving car?

the kinetic energy of a moving car object is KE=1/2mv^2. create and test a function called KE to find the kinetic energy of a moving car if you know the mass m and the velocity v of the vehicle.

## What is the kinetic energy of a moving car?

The kinetic energy stored in a moving vehicle is related to the mass and speed of the vehicle by the equation E = ½mv². All else being equal, if your car is twice as heavy it has twice the kinetic energy and if it is moving twice as fast it has four times the kinetic energy.

## What is the kinetic energy of a 1500 kg car moving at 20 ms?

Therefore, the kinetic energy of the car is 300,000 J.