A 1000kg truck traveling at 15m/s has the choice of hitting a brick wall or a line of bushes. Which is the better choice. Use momentum, impulse and law of conservation of momentum in your reasoning

The better choice is the line of bushes.

Explanation:

Momentum is defined as the force in a time interval. But the linear momentum is also equal to the product of mass by Velocity.

Now assuming that the truck hits the wall in a very short time interval, i.e. around 0.5 [s], we can calculate the force of the impact.

While if you enter a region of bushes. It won't crash with a solid object. Therefore the bushes will not develop a great impact force on the truck.

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.