Question

An object is moving with a uliform velocity of 9 km/h and 1250 J of kinetic energy. What is mass of the object? Open original​

Answer 1

Answer:

The required mass of the object is 400 kg.

Explanation:

Given :

An object is moving with a uniform velocity of 9 km/h and 1250 J of kinetic energy.

To find :

the mass of the object.

Solution :

The kinetic energy of an object is the energy possessed by virtue of its motion.

It's given by the expression,

$\sf KE = \dfrac{1}{2} mv^2$

where

m denotes the mass of the object

v denotes the velocity of the object

velocity, v = 9 kmph

= 9 × 5/18 m/s

= 2.5 m/s

Substituting the values,

KE = ½ mv²

1250 = ½ × m × 2.5²

1250 × 2 = m × 6.25

2500 = m × 6.25

m = 2500/6.25

m = 400 kg

Therefore, the mass of the object is 400 kg.