1. a car is traveling 60 miles per hours on cruise control. what is the net force? 2. an object of mass 10kg is accelerated upward at 2m/s^2. what force is required? 3. what is the mass of an object if a force of 17n causes it to accelerate at 1.5m/s/s?

Solution: (a) The net force is zero because car is travelling with same speed that is 60 miles per hour or there is no acceleration.

(b) Mass of object is 10 kg

Acceleration is 2 m/s², thus force can be calculated as follows:

F=m×a

Here, m is mass of object and a is its acceleration thus,

F=10 kg×2 m/s²

=20 kg m/s²

Here, 1 N=1 kg m/s²

Thus, F=20 N

(c) Force on object is 17 N and its acceleration is 1.5 m/s².

Mass of the object can be calculated as follows:

m=\frac{F}{a}

thus,

m=\frac{17 N}{1.5 m/s^{2}}=11.33 (\frac{N}{m/s^{2}})

Here, 1 N=1 kg m/s²

Thus,

m=11.33 kg

first let us lay out the formula for potential

and kinetic energy:

pe = mgh

ke = (mv^2)/2

where: m=mass, v=velocity, g=gravitational

acceleration, h=height

calculating for mass using the known values of

pe:

340j = m (9.81 m/s^2) (50ft) (1m/3.28ft)

m = 2.27 kg

the law of conservation of energy states that

energy is neither created nor destroyed. therefore, the change in kinetic

energy from 50 ft to 35 ft would be equal to the change in potential energy

from 50 ft to 35 ft. however it would be opposite in signs since one is losing

while other is gaining.

ke(35ft) – ke(50ft) = - [ pe(35ft) – pe(50ft]

ke(50ft) = 0 since the brick is initially at rest

ke(35ft) = 340j - 2.27kg (9.81 m/s^2) (35ft)

(1m/3.28 ft)

ke(35ft)

= 102.38 j

im pretty sure its b