Acar moving with a velocity of 20 meters/second has 1.8 × 105 joules of kinetic energy. what is the mass of the car? a.) 4.6 × 102 kilograms b.) 9.0 × 102 kilograms c.) 1.0 × 103 kilograms d.) 1.2 × 103 kilograms

The correct answer is .

Explanation:

The expression for the kinetic energy is as follows;

Here, m is the mass of the object and v is the velocity.

It is given in the problem that A car moving with a velocity of 20 meters/second has of kinetic energy.

Calculate the mass of the car by rearranging the above expression.

Put and v= 20 m/s.

Therefore, the correct option is (B).

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

the total distance traveled by the car is

30km + 49km = 79 km .