Question

A cannon ball of mass 500g is fired with a speed of 15ms^-1. Find : (i) its kinetic enerdy (ii) its momentum

Answer 1

i)kinetic energy is half multiplied by mass times velocity squared.

M=500g=0.5kg

V=15m/s

=1/2mv^2
=1/2(0.5)(15)(15)
=(7.5)(7.5)
=56.25j


ii)momentum is equal to mass of the body multiplied by velocity of the body

M=500g=0.5kg

V=15m/s

=mv
=(0.5)(15)
=7.5 kgm/s

Hope it helps dude.

Answer 2

The kinetic energy and momentum of the ball is 56.25 J and 7.5 kg-m/s respectively.

Explanation:

Given that,

Mass of the ball, m = 500 g = 0.5 kg

Speed of the ball, v = 15 m/s

We need to find its kinetic energy and momentum. The kinetic energy is possessed by virtue of its motion. It is given by :

$E=\dfrac{1}{2}mv^2$

$E=\dfrac{1}{2}\times 0.5\times (15)^2$

E = 56.25 J

The product of mass and velocity is called momentum of an object. It is given by :

p = mv

$p=0.5\ kg\times 15\ m/s$

p = 7.5 kg-m/s

So, the kinetic energy and momentum of the ball is 56.25 J and 7.5 kg-m/s respectively. Hence, this is the required solution.

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