Question

Driving home in a hurry on the highway back from Holyrood, Harry and Harriet in their
new Honda hatchback convertible, see a moose in their path a distance d = 71.0 m down
the road . Travelling at 110 km/h, Harry applies the brakes causing the car to slow down
with an acceleration a = 25.0 km/h per second. The mass of the car and occupants is
1480 kg.
a)By calculating how far the car travels, determine the answer to the question “Do Harry
and Harriet hit the moose?”?
b) What is the work down by the road in bringing the car to a halt?

Answer 1

i can do the b part, but really need help with the a part

Answer 2

this is an important kinematic equation you should know:\[v_f^2=v_i^2+2ad\]where vf is the final velocity and vi id the initial velocity. In this case acceleration is negative, and the final velocity is zero, so this equation becomes\[0=v_i^2-2ad\]solve this for d. If d<71 meters, they don't hit the moose.

Answer 3

thanks