Explanation:
It is given that,
Initial speed of the automobile, u = 65 km/hr =
Final speed of the automobile, v = 0
Deceleration of the automobile, 
We need to find the distance covered by the car as it comes to rest. It can be calculated using third equation of motion as :



So, the acceleration of the car is
. Hence, this is the required solution.
W = 980N. The weight of an object of 100Kg in the Earth is 980N.
The weight is a measure of the gravitational force acting on an object, the weight is equivalent to the force exerted by a body on a point of support, caused by the action of the local gravitational field on the mass of the body.
it can be defined as the product of mass by the acceleration of gravity, w = mg. Since weight is a force, its unit is the Newton N.
If the mass of an object on earth is 100 kg, then is weight is:
W = (100Kg)(9.8m/s²) = 980N.
Answer:
a. tension of the cable attached to chair = 2.77kN
b. speed of the chair = 10.38m/s
Explanation:
A. tension of the cable is calculated by mass of the chair multiply by gravitational acceleration.
Tension(T) = m*g
where, m= 283kg
length of cable = 11m
and g=9.8m/s2
tension = mg = 283*9.8
=2773.4 N = 2.77kN
b. speed of the chair = 
= 10.38m/s