Question

Please help, just one question. Explain.

What is the average acceleration of a jet ski that goes from rest to 10 m/s west in 4 s? Take the direction west to be positive, and east to be negative. Explain.                             

                      A. 2.5 m/s^2                                                

                      B. -2.5 m/s^2                                                

                      C. 0.4 m/s^2                                                

                      D. -0.4 m/s^2

Answer 1

v=u+at
here
u=0
v=10
t=4
so
a=2.5m/s^2