Answer:
2.89 hours
Explanation:
given :
Vo = 72 km/h
Vt = 90 km/h
S = 234 km
find : the time taken (t) = ?
solution :
2.a.s = Vt² - Vo²
2.a.(234) = 90²- 72²
468.a = 8100 - 5184
= 2916
a = 2916/468 = 6.23 km/h²
so,
t = (Vt-Vo) /a
= (90-72)/ 6.23
= 18/ 6.23
= 2.89 hours
Answer:
There cannot be a force without motion and if there is no motion, then there is no force acting.
Explanation:
A force is a vector that causes an object with mass to accelerate.
The answer is either B or C
Answer:
D ) Elastic and Gravitational
Explanation:
Mechanical energy is defined as the sum of elastic, potential and kinetic energies.
Therefore potential energy and gravitational or potential energy are contemplated within the definition of mechanical energy.
The units for energy are given in joules [J] for the SI and Btu for the IP system