1. The velocity-time graph above represents the motion of a coach moving along a straight horizontal road. At time t= o the coach has velocity U ms. For the next ten seconds, until it reaches a velocity of 15 ms -1. During the next twenty seconds, the coach travels through a tunnel with a constant velocity of 15 ms -1. After emerging from the tunnel the coach travels with constant acceleration an ms -?, reaching a velocity U ms -1 after a further twenty seconds. a)Calculate the length of the tunnel.
b) Given that the total distance travelled by the coach during the fifty seconds is 800 metres,
find (i) the value of U,
(ii) the value of a.
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THE RIGHT answer of this will be 300
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