Question

An object of mass 20 kg is accelerated from rest to 20 ms1 in 20 second calculate

Answer 1

Answer:

Explanation:

we know that, F = ma

so , here m = 50 kg , u = 0 , v = 20 m/s , t = 20 seconds

First we have to find acceleration,

v = u + at

20 = 0 + a*20

a = 20/20 = 1 m/s^2

now ,

Force = m*a = 20*1

Force = 20N

Answer 2

$acceleration=1m {s}^{ - 1} \: \: and \\ force=20 \: N$

Explanation:

$Given, \: \: m = 20 \: kg, \: u = 0 \: m {s}^{ - 1} , \: v = 20 \: m {s}^{ - 1} , \: \: and \: \: t = 20 \: s \\ we \: \: know \: \: \boxed{v = u + at} \: \: then, \\ 20 = 0 + a \times 20 \\ 20 = a \times 20 \\ a = 1 \: m {s}^{ - 2} \\ Now, \: \: we \: \: know \: \: \boxed{force = mass \times acceleration} \\ = 20 \: kg\times 1 \: m {s}^{ - 2} = 20 \: N$