Question

a 10kg mass rests on a horizontal frictionless table. how much energy is needed to accelerate the mass from rest to a speed of 5 m/s ?​

Answer 1

Answer:

125 joules

Explanation:

Given,

mass = 10 kg

initial velocity= 0 m/s

final velocity= 5 m/s

to find:energy required to acc. the mass

since speed/velocity is involved the energy required is kinetic energy, which is the energy possessed by a body by virtue of its motion.

kinetic energy = 1/2*m*v^2, where m is mass and v is speed [kinetic energy depends on speed not velocity]

1/2*10*5*5=

125 joules

Answer 2

Answer:

125J

Explanation:

use the formula 1/2 mv^2

1/2*10*5^2

=10*25

125J