Question

A mass of 2.3 kg is initially moving at 5 m/s. A constant force of 15N is applied to the mass for 6 seconds. Find (a) the initial momentum, (b) final momentum.

Answer 1

Given:

$m=2.3\:\rm kg$

$v_1=5\:\rm m/s$

$F=15\:\rm N$

$t=6\:\rm s$

(a) The initial momentum

$$p_i=mv_1=2.3*5=11.5\:\rm kg*m/s$$

(b) the final momentum

$$p_f=p_i+Ft=11.5+15*6=101.5\:\rm kg*m/s$$