Question

A train travelling along a straight track starts from rest at point
A and accelerates uniformly to 20 ms' in 20 s. It travels at
this speed for 60 s, then slows down uniformly to rest in 40 s
at point C. It stays at rest at C for 30 s, then reverses direction,
accelerating uniformly to 10 ms'in 10 s. It travels at this speed
for 30 s, then slows down uniformly to rest in 10 s when it
reaches point B.
A.Plot a graph of the motion of the train.
B.use your graph to calculate
i. the train displacement from point A when it reaches point C.
ii. the train's displacement from point A when it reaches point B.
iii. the train's acceleration each time it's speed changes​

Answer 1

Step-by-step explanation:

A train travelling along a straight track starts from rest at point

A and accelerates uniformly to 20 ms' in 20 s. It travels at

this speed for 60 s, then slows down uniformly to rest in 40 s

at point C. It stays at rest at C for 30 s, then reverses direction,

accelerating uniformly to 10 ms'in 10 s. It travels at this speed

for 30 s, then slows down uniformly to rest in 10 s when it

reaches point B.

A.Plot a graph of the motion of the train.

B.use your graph to calculate

i. the train displacement from point A when it reaches point C.

ii. the train's displacement from point A when it reaches point B.

iii. the train's acceleration each time it's speed changes