Answer:
356 N
Explanation:
Newton's second law of motion describes the relationship between an object's mass and the amount of force needed to accelerate it.
here there is a weight acting downwards on the object , yet it is accelerating upwards shows that there is a net force upwards
Applying Newtons second law of motion upwards ,
Force = mass *acceleration
Upward force - m*g = m *a
F_up= 20 *8 + 20 * 9.8
= 356 N
Upward force= 160 N
Answer:
0.014s
Explanation:
Given parameters:
mass of golf ball = 0.059kg
force applied = 290N
velocity = 69m/s
initial velocity = 0m/s
Unknown:
Time of contact = ?
Solution;
We know that momentum is the quantity of motion of body possess;
Momentum = mass x velocity
Momentum = 0.059 x 69 = 4.1kgm/s
Also; impulse is the effect of the force acting on a body;
impulse = force x time = momentum
So;
Force x time = momentum
Time = =
= 0.014s