Question

Find the magnitude of net force on a 20 kg mass if it accelerates uniformely from 2.5m/s to 5.8m/s in 3 seconds

Answer 1

Hey.

Here is the answer.

As

$v = u + at \\ \\ v = 5.8m {s}^{ - 1} \\ u = 2.5m {s}^{ - 1} \\ t = 3s \\ \\ \: so \: 5.8 = 2.5 + a \times 3 \\ \\ or \: \: 5.8 - 2.5 = 3t \\ \\ or \: 3.3 = 3a \\ \\ or \: \: a = 1.1m {s}^{ - 2} \\ \\ also \: as \: mass \: = 20 \: kg \\ \\ and \: force \: = \: ma \\ \\ so \: \: force \: \: = \: 20 \times 1.1 \: newtons \\ \\ or \: force \: \: is \: 22 \: newtons \\ \\ thanks$