Answer to Question #349938 in Physics for Professor Proton

Question

From 12 m/s to 54 km/hr , a 1500 kg jeepney accelerates that produce a force of 450 N. Find

a) the momentum of the jeepney.

b) the time to accelerate ?

Answer 1

Given:

$v_i=12\:\rm m/s$

$v_f=54\:\rm km/h=15\:\rm m/s$

$m=1500\:\rm kg$

$F=450\:\rm N$

(a)

$p_i=mv_i=1500*12=18000\:\rm kg\cdot m/s$

$p_f=mv_f=1500*15=22500\:\rm kg\cdot m/s$

(b)

$F=\frac{\Delta p}{\Delta t}$

$\Delta t=\frac{\Delta p}{F}=\frac{22500-18000}{450}=10\:\rm s$