Question

A new brand tesla car has mass of 3000 kg .initially it has kinetic energy is 5000 joules after some time crash and momentum becomes zero .find the impulse.​

Answer 1

Answer:Mass (m) = 5000 kg

Initial speed (vo) = 0 m/s (car rest)

Final speed (vt) = 20 m/s

Wanted : net work

Solution :

The work-kinetic energy principle :

Wnet = ΔEK

Wnet = ½ m (vt2 – vo2)

Wnet = net work

ΔEK = the change in kinetik energy

m = mass (kg),

vt = final speed (m/s),

vo = initial speed (m/s).

Net work :

Wnet = ½ m (vt2 – vo2)

Wnet = ½ (5000)(202 – 02)

Wnet = (2500)(400 – 0)

Wnet = (2500)(400)

Wnet = 1000,000 Joule

 

: