Question

a pulse has a speed of 0,5m.s-1 .How long does it takes to cover distance of 25cm

Answer 1

Speed(v) = 0.5 m/s

Distance covered = 25 cm = 0.25 meter

As we know, Speed is defined as distance travelled by body per unit time,

or, v = distance / time

or, 0.5 = 0.25 / time

or, time = 0.25 / 0.5

or, time = 0.05 seconds

Therefore, it takes 0.05 seconds to cover distance of 25cm

Answer 2

Answer:

Mass of the bullet is mb=50gm=0.05Kg

Initial velocity of bullet ub=100m/s

Final velocity is vb=0m/s

(1) Initial momentum of bullet pi=mbub=5Kgm/s

(2) Final momentum of bullet pf=mbvb=0.05×0=0