Homework Answers
4.a) impulse= force*time =150*(10-5)= 750 N.s
b) when force was applied the acceleration (a )oft cart = force/mass= 150/75= 2m/s^2 [ it is decceleation]
Speed of the cart u= at [equation of motion
v= u-at,final speed is zero]
u=2*15=30 m/ s.
c) if F= 150*1/3= 50N then a= 50/75= 2/3
From equation v= u-at
Or 0=30-2/3* t
Or t=30*3/2= 45 s
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