Question

the speed of car changes from 36 km per hour to 72 km per hour in 10 seconds if mass of car is 500 kg then find (1)acceleration (2)force on car (3) in the its kinetic energy​

Answer 1

initial speed of car(u)=36km/hr=10m/s

final speed of car(v)=72km/hr=20m/s

time taken(t)= 10s

therefore,

(1.) acceleration=(v-u))t=(20-10)/10=1m/s*2

(2.) force=mass*acceleration
=500*1=500N

(3.) initial kinetic energy=MU*2/2=500*100/2=25000J
Final kinetic energy= MV*2/2=500*400/2=100000J