Question

An object moves along the x-axis .The x-coordinate is given as a functiom of time x=(7t-3t^2) where x is in meter and t in seconds , its average speed over the interval t=0 to t=4

Answer 1

Explanation:

here given equn

x=(7t-3t^2)

dx/dt=d(3t^2-7t)/dt

2•3t^2-1-7•1

x=6t-7

now t-0

x=6•0-7=-7unit

for the 2nd value t=4

x=6•4-7=17u