45. 25 m
45.50 m
56.00 m
56.25 m
Correct answer is D
h=45t−9t2
dhdt=45−18t=0
45=18t⟹t=2.5s
h(2.5)=45(2.5)−9(2.5)2=112.5−56.25
= 56.25m.
Find the locus of points which is equidistant from P(4, 5) and Q(-6, -1). ...
Consider the following statements: p: Birds fly q: The sky is blue r: The grass is green W...
The fourth term of a geometric sequence is 2 and the sixth term is 8. Find the common ratio. ...
The sum of the first n terms of a linear sequence is Sn=n2+2n. Determine the general t...
Given that f(x)=5x2−4x+3, find the coordinates of the point where the gradient is 6....
Determine the coefficient of x2 in the expansion of (a+3x)6...
The table shows the distribution of marks obtained by some students in a test Marks 0-9 10-...