Question

An object A of mass 10 kg is moving with a velocity of 6 m/s. Calculate its kinetic energy and its momentum. If a constant opposing force of 20 N suddenly acts on A, find the times it takes to come to rest and the distance through which it moves

Answer 1

\[E = \frac{ 1 }{ 2 } m v ^2 \]

Is Kinetic Energy

\[p = mv\]

for momentum

\[v = u + a t\]

where \[u = 6\] \[a = -20\] \[v = 0\]

Rearrange \[v = u + a t\] so that t is the subject