Question

4. An object is initially travelling at 3ms and then it accelerates at 1.4ms? for the
next 4s. It then accelerates at 2.2ms for the next 5 seconds. find:
a) Velocity of the object after 9 seconds.
b) Displacement of the object after 9 seconds.​

Answer 1

Answer:

v= u + at

v= 3+ 1.4*4=8.6

S = ut + 1/2at^2

S1= 12 + 11.2= 23.2

S2= 8.6*5+ 1/2*5^2*2.2

S2= 43 + 27.5= 70.5

total= 93.7m