a truck with mass of 2000 kg speeding at 36 km/hour crash into a tree and stopped in 0.1 second. The average force exerted on the truck during the crash is

A. 200N
B. 2000N
C. 20000N
D. 200000N
E. 2000000N

Question

a truck with mass of 2000 kg speeding at 36 km/hour crash into a tree and stopped in 0.1 second. The average force exerted on the truck during the crash is
 
A. 200N
B. 2000N
C. 20000N
D. 200000N
E. 2000000N

anonymous · Answer

Convert the velocity to m/s.  Then equate impulse with change in momentum to find the average force.
$$\color{green}{\vec{F} \Delta t = m \Delta \vec{v}}$$

anonymous · Answer

do you mean the 36km/hour

anonymous · Answer

Yes. Convert it into m/s.

abhisar · Answer

Hello @dinisha !

abhisar · Answer

36 km/hr = 10m/s

abhisar · Answer

by using v=u+at, we can calculate the accelaration a

abhisar · Answer

here, v=0
u=10m/s & t=0.1sec

abhisar · Answer

now using F=ma we can calculate the force,
here m=2000kg

abhisar · Answer

Hope it helped

anonymous · Answer

yaa really alot @Abhisar .. the answer will be D 200000N

anonymous · Answer

NIce. Both methods will work. Abishar's is a bit easier to follow.

abhisar · Answer

$\Huge\text{Anytime !}$
$\huge\ddot\smile$

anonymous · Answer

Oops ... sorry I misspelled your handle Abhisar.

abhisar · Answer

it's all ryt @ghuczek !