Question

force = Mass x Acceleration. find the force
acting on a mass of 20kg for 5s & changes
in velocity from 5m/s to 20m/s .​

Answer 1

Answer:

Kinetic energy is given by the expression, (E k) v = 1/2 mv^2

Where,

E k= Kinetic energy of the object moving with a velocity, v

(i) Kinetic energy when the object was moving with a velocity 5 m s-1

(E k)5 = 1/2 — 20 — (5)2 = 250 J

Kinetic energy when the object was moving with a velocity 2 m s-1

(E k)2 = (1 )/2x 20 — (2)2 = 40 J.

Answer 2

Answer:

-60N

Explanation:

Given: m=20kg

t=5s

u=5m/s

v=20m/s

F=ma

a=v-u / t

=5-20 / 5

=-15 /5

=-3ms^-2

F=ma

=20*(-3)

=-60N

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