Question

if the car has a mass of 1200 kg what will be its a change in velocity with full explanation​

Answer 1

Answer:

Given :        Mass of the motorcar, M=1200kg

                   Initial velocity of the car, u=90 km/h=25 m/s              (∵1km/h=185m/s)

                   Final velocity of the car, v=18 km/h=5 m/s

                   Time taken          t=4 s 

ΔP=mv−mu

ΔP=1200×5−1200×25=−24000  kg m/s

v=u+at

5=25+a×4               

⟹a=−5  m/s2          (-ve shows retardation)

∣F∣=m∣a∣=1200×5=6000 N