Question

5) A car is subjected to a force for 20 seconds which causes it to accelerate from 36 km/hr to

144 km/hr. What will the displacement of the car 30 seconds after application of the force​

Answer 1

Answer:

48675m or 1200m

Explanation:

if we change it into m/s

the v1= 10m/s

v2 is 40m/s

using the formula

vf=vi+a.t

40=10+a.20s

a=1.5 m/s^2

if we assume the force still applied after 20sec

s=vi.t+(0.5).a.t^2

s=40^2 . 30s+ (0.5).1.5.30sec^2

s=48675m

if the force is gone then

s=40m/s . 30s=1200m