if two equal are forces odf 15 N is acting on body by mean of astretched string then net force or tensiin in string is : a:5N b:10N c:0 d:15N

t.                 w               e                 n                   t                 y                 c             h               a           r           a               c                 t             e             r             s        

it may be wrong but i think its a

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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i guess it’s a and b