Answer:
(a) Mass of the car will be 56.8285 kg
(b) Distance traveled in next 4.20 sec will be 33.9619 m
Step-by-step explanation:
We have given horizontal force F = 73 N
As it is given that the block starts from the rest so initial velocity u = 0 m/sec
Distance traveled s = 13 m
Time t = 4.5 sec
(a) From second equation of motion



Now according to newton second law force F = ma
So mass

(b) Velocity after 4.20 sec v = u+at
v=0+1.2839×4.20 = 5.39 m/sec
So initial velocity for second case = 5.39 m/sec
From second equation of motion

