400.0N
40.0N
4.0N
0.4N
Correct answer is B
F = \(\mu\)mg
= 0.2 x 20 x 10
= 40N
A cone in an unstable equilibrium has its potential energy
decreased
increased
unchanged
oscillating
Correct answer is B
No explanation has been provided for this answer.
250J
1000J
10 000J
100 000J
Correct answer is B
P.E = K.E = mgh
= 50 x 10 x 2 = 1000J
The energy is costant but the linear momentum varies
The linear momentum is conatant but the energy varies
both energy and linear momentum are constant
The speed and the linear velocity are both constant
Correct answer is C
No explanation has been provided for this answer.
A motor vehicle is brought to rest from a speed of 15ms-1 in 20 seconds. Calculate the retardation.
0.75ms-1
1.33ms-2
5.00ms-2
7.50ms-2
Correct answer is A
Retardation = \(\frac{u - v}{t}\)
= \(\frac{15 -0}{20}\)
= 0.75ms-1