Question

A speedboat is moving along a straight line at a speed of 54km/h stops in 5 seconds after the brakes are applied.
[a] Find the acceleration assuming it to be constant.
Plot the graph of speed versus time. Using the graph find the distance covered by speedboat after brakes are applied

Answer 1

given 
u=54km/h=(54x5/18)m/s=15m/s
v=0
t=5s
we know 
a=(v-u)/t
a=(0-15)/5
a=-$-3 ms^{-2}$

graph-see the attachment