Question

If 250 J of work is done in sliding a 5 kg block up inclined plane of height 4m. Work done against friction is ????? (g = 10m/s^2)
a) 50J
b) 100J
c) 200J
d) zero

Answer 1

Answer:

2ooJ

Explanation:

hoose the correct one.

Example 1: The solution of the equation 3x + 5 = 0 is

(a)

5

3 (b) – 5 (c) - 5

3 (d) 5

Solution : Correct answer is (c).

Example 2: –1 is not a solution of the equation

(a) x + 1 = 0 (b) x – 1 = 2 (c) 2y + 3 =1 (d) 2p + 7 = 5

Solution : Correct answer is (b).

Example 3: Which of the following equations can be formed using

the expression x = 5:

(a) 2x + 3 = 13 (b) 3x + 2 = 13

(c) x – 5 = 1 (d) 4x – 9 =21

Solution: Correct answer is (a).

[Hint: x = 5 on multiplying both sides by 2 gives 2x = 10

which on adding 3 both sides gives 2x + 3 =13]

An equation is a mathematical sentence that uses

an equality sign to show that two expressions have

the same value. All of these are equations.

3 + 8 = 11 r + 6 = 14 – 24 = x – 7 100 – 50

2

− =

To solve an equation that contains a variable, find the value of the variable

that makes the equation true. This value of the variable is called the